diff --git a/reactos/ntoskrnl/cc/pin.c b/reactos/ntoskrnl/cc/pin.c
index a439d78fb11..960803284ef 100644
--- a/reactos/ntoskrnl/cc/pin.c
+++ b/reactos/ntoskrnl/cc/pin.c
@@ -165,7 +165,7 @@ CcPreparePinWrite (
     /*
      * FIXME: This is function is similar to CcPinRead, but doesn't
      * read the data if they're not present. Instead it should just
-     * prepare the VACBs and zero them out if Zero == TRUE.
+     * prepare the VACBs and zero them out if Zero != FALSE.
      *
      * For now calling CcPinRead is better than returning error or
      * just having UNIMPLEMENTED here.
diff --git a/reactos/ntoskrnl/config/cmapi.c b/reactos/ntoskrnl/config/cmapi.c
index dd140824663..40a830c10fc 100644
--- a/reactos/ntoskrnl/config/cmapi.c
+++ b/reactos/ntoskrnl/config/cmapi.c
@@ -2188,7 +2188,7 @@ CmCountOpenSubKeys(IN PCM_KEY_CONTROL_BLOCK RootKcb,
                         /* Count the current hash entry if it is in use */
                         SubKeys++;
                     }
-                    else if ((CachedKcb->RefCount == 0) && (RemoveEmptyCacheEntries == TRUE))
+                    else if ((CachedKcb->RefCount == 0) && (RemoveEmptyCacheEntries != FALSE))
                     {
                         /* Remove the current key from the delayed close list */
                         CmpRemoveFromDelayedClose(CachedKcb);
diff --git a/reactos/ntoskrnl/fsrtl/fastio.c b/reactos/ntoskrnl/fsrtl/fastio.c
index 174c8bc4638..d3ea273a128 100644
--- a/reactos/ntoskrnl/fsrtl/fastio.c
+++ b/reactos/ntoskrnl/fsrtl/fastio.c
@@ -218,7 +218,7 @@ FsRtlCopyRead(IN PFILE_OBJECT FileObject,
             /* File was accessed */
             FileObject->Flags |= FO_FILE_FAST_IO_READ;
 
-            if (Result == TRUE)
+            if (Result != FALSE)
             {
                 ASSERT((IoStatus->Status == STATUS_END_OF_FILE) ||
                        (((ULONGLONG)FileOffset->QuadPart + IoStatus->Information) <=
@@ -227,7 +227,7 @@ FsRtlCopyRead(IN PFILE_OBJECT FileObject,
         }
 
         /* Update the current file offset */
-        if (Result == TRUE)
+        if (Result != FALSE)
         {
             FileObject->CurrentByteOffset.QuadPart = FileOffset->QuadPart + IoStatus->Information;
         }
@@ -343,7 +343,7 @@ FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
          * If we append, use the file size as offset.
          * Also, check that we aren't crossing the 4GB boundary.
          */
-        if (FileOffsetAppend == TRUE)
+        if (FileOffsetAppend != FALSE)
         {
             Offset.LowPart = FcbHeader->FileSize.LowPart;
             NewSize.LowPart = FcbHeader->FileSize.LowPart + Length;
@@ -381,7 +381,7 @@ FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
                 /* Then we need to acquire the resource exclusive */
                 ExReleaseResourceLite(FcbHeader->Resource);
                 ExAcquireResourceExclusiveLite(FcbHeader->Resource, TRUE);
-                if (FileOffsetAppend == TRUE)
+                if (FileOffsetAppend != FALSE)
                 {
                     Offset.LowPart = FcbHeader->FileSize.LowPart; // ??
                     NewSize.LowPart = FcbHeader->FileSize.LowPart + Length;
@@ -483,7 +483,7 @@ FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
         PsGetCurrentThread()->TopLevelIrp = 0;
 
         /* Did the operation succeed? */
-        if (Result == TRUE)
+        if (Result != FALSE)
         {
             /* Update the valid file size if necessary */
             if (NewSize.LowPart > FcbHeader->ValidDataLength.LowPart)
@@ -568,7 +568,7 @@ FsRtlCopyWrite(IN PFILE_OBJECT FileObject,
         }
 
         /* Check if we are appending */
-        if (FileOffsetAppend == TRUE)
+        if (FileOffsetAppend != FALSE)
         {
             Offset.QuadPart = FcbHeader->FileSize.QuadPart;
             NewSize.QuadPart = FcbHeader->FileSize.QuadPart + Length;
@@ -1338,7 +1338,7 @@ FsRtlPrepareMdlWriteDev(IN PFILE_OBJECT FileObject,
     }
 
     /* Check if we are appending */
-    if (FileOffsetAppend == TRUE)
+    if (FileOffsetAppend != FALSE)
     {
         Offset.QuadPart = FcbHeader->FileSize.QuadPart;
         NewSize.QuadPart = FcbHeader->FileSize.QuadPart + Length;
diff --git a/reactos/ntoskrnl/fstub/disksup.c b/reactos/ntoskrnl/fstub/disksup.c
index f5aeb4192f1..9008f81465b 100644
--- a/reactos/ntoskrnl/fstub/disksup.c
+++ b/reactos/ntoskrnl/fstub/disksup.c
@@ -672,7 +672,7 @@ xHalIoAssignDriveLetters(IN PLOADER_PARAMETER_BLOCK LoaderBlock,
             /* Search for bootable partition */
             for (j = 0; j < NUM_PARTITION_TABLE_ENTRIES && j < LayoutArray[DiskNumber]->PartitionCount; j++)
             {
-                if ((LayoutArray[DiskNumber]->PartitionEntry[j].BootIndicator == TRUE) &&
+                if ((LayoutArray[DiskNumber]->PartitionEntry[j].BootIndicator != FALSE) &&
                     IsRecognizedPartition(LayoutArray[DiskNumber]->PartitionEntry[j].PartitionType))
                 {
                     if (LayoutArray[DiskNumber]->PartitionEntry[j].RewritePartition == FALSE)
diff --git a/reactos/ntoskrnl/include/internal/ke_x.h b/reactos/ntoskrnl/include/internal/ke_x.h
index 5b2dbc900ca..11d84e4e015 100644
--- a/reactos/ntoskrnl/include/internal/ke_x.h
+++ b/reactos/ntoskrnl/include/internal/ke_x.h
@@ -514,7 +514,7 @@ KiTryThreadLock(IN PKTHREAD Thread)
     Value = InterlockedExchange((PLONG)&Thread->ThreadLock, Value);
 
     /* Return the lock state */
-    return (Value == TRUE);
+    return (Value == 1);
 }
 
 FORCEINLINE
diff --git a/reactos/ntoskrnl/io/iomgr/driver.c b/reactos/ntoskrnl/io/iomgr/driver.c
index 9f54c174776..92a4615df8c 100644
--- a/reactos/ntoskrnl/io/iomgr/driver.c
+++ b/reactos/ntoskrnl/io/iomgr/driver.c
@@ -127,7 +127,7 @@ IopGetDriverObject(
     DriverName.Length = 0;
     DriverName.MaximumLength = sizeof(NameBuffer);
 
-    if (FileSystem == TRUE)
+    if (FileSystem != FALSE)
         RtlAppendUnicodeToString(&DriverName, FILESYSTEM_ROOT_NAME);
     else
         RtlAppendUnicodeToString(&DriverName, DRIVER_ROOT_NAME);
@@ -494,7 +494,7 @@ IopInitializeDriverModule(
     /* Create ModuleName string */
     if (ServiceName && ServiceName->Length > 0)
     {
-        if (FileSystemDriver == TRUE)
+        if (FileSystemDriver != FALSE)
             wcscpy(NameBuffer, FILESYSTEM_ROOT_NAME);
         else
             wcscpy(NameBuffer, DRIVER_ROOT_NAME);
diff --git a/reactos/ntoskrnl/io/iomgr/file.c b/reactos/ntoskrnl/io/iomgr/file.c
index febc5e517b9..74ce63fd36d 100644
--- a/reactos/ntoskrnl/io/iomgr/file.c
+++ b/reactos/ntoskrnl/io/iomgr/file.c
@@ -2104,7 +2104,7 @@ IoCreateFile(OUT PHANDLE FileHandle,
     }
 
     /* Check if we were 100% successful */
-    if ((OpenPacket->ParseCheck == TRUE) && (OpenPacket->FileObject))
+    if ((OpenPacket->ParseCheck != FALSE) && (OpenPacket->FileObject))
     {
         /* Dereference the File Object */
         ObDereferenceObject(OpenPacket->FileObject);
@@ -2375,7 +2375,7 @@ IoFastQueryNetworkAttributes(IN POBJECT_ATTRIBUTES ObjectAttributes,
                                 DesiredAccess,
                                 &OpenPacket,
                                 &Handle);
-    if (OpenPacket.ParseCheck != TRUE)
+    if (OpenPacket.ParseCheck == FALSE)
     {
         /* Parse failed */
         IoStatus->Status = Status;
@@ -3188,7 +3188,7 @@ NtDeleteFile(IN POBJECT_ATTRIBUTES ObjectAttributes)
                                 DELETE,
                                 &OpenPacket,
                                 &Handle);
-    if (OpenPacket.ParseCheck != TRUE) return Status;
+    if (OpenPacket.ParseCheck == FALSE) return Status;
 
     /* Retrn the Io status */
     return OpenPacket.FinalStatus;
diff --git a/reactos/ntoskrnl/kd64/kdapi.c b/reactos/ntoskrnl/kd64/kdapi.c
index 5ea86413fd8..1c427922f7a 100644
--- a/reactos/ntoskrnl/kd64/kdapi.c
+++ b/reactos/ntoskrnl/kd64/kdapi.c
@@ -721,7 +721,7 @@ KdpSetContext(IN PDBGKD_MANIPULATE_STATE64 State,
     ASSERT(Data->Length == sizeof(CONTEXT));
 
     /* Make sure that this is a valid request */
-    if ((State->Processor < KeNumberProcessors) && (KdpContextSent == TRUE))
+    if ((State->Processor < KeNumberProcessors) && (KdpContextSent != FALSE))
     {
         /* Check if the request is for this CPU */
         if (State->Processor == KeGetCurrentPrcb()->Number)
diff --git a/reactos/ntoskrnl/ke/amd64/except.c b/reactos/ntoskrnl/ke/amd64/except.c
index 2cdda75b9ba..00731e82e3b 100644
--- a/reactos/ntoskrnl/ke/amd64/except.c
+++ b/reactos/ntoskrnl/ke/amd64/except.c
@@ -277,7 +277,7 @@ KiDispatchException(IN PEXCEPTION_RECORD ExceptionRecord,
     if (PreviousMode == KernelMode)
     {
         /* Check if this is a first-chance exception */
-        if (FirstChance == TRUE)
+        if (FirstChance)
         {
             /* Break into the debugger for the first time */
             if (KiDebugRoutine(TrapFrame,
diff --git a/reactos/ntoskrnl/ke/arm/exp.c b/reactos/ntoskrnl/ke/arm/exp.c
index ddc94a30c70..f85b8cc5dc5 100644
--- a/reactos/ntoskrnl/ke/arm/exp.c
+++ b/reactos/ntoskrnl/ke/arm/exp.c
@@ -218,7 +218,7 @@ KiDispatchException(IN PEXCEPTION_RECORD ExceptionRecord,
     if (PreviousMode == KernelMode)
     {
         /* Check if this is a first-chance exception */
-        if (FirstChance == TRUE)
+        if (FirstChance != FALSE)
         {
             /* Break into the debugger for the first time */
             if (KiDebugRoutine(TrapFrame,
diff --git a/reactos/ntoskrnl/ke/bug.c b/reactos/ntoskrnl/ke/bug.c
index d0a3f3acf0d..c1cd54fd952 100644
--- a/reactos/ntoskrnl/ke/bug.c
+++ b/reactos/ntoskrnl/ke/bug.c
@@ -67,7 +67,7 @@ KiPcToFileHeader(IN PVOID Pc,
             i++;
 
             /* Check if this is a kernel entry and we only want drivers */
-            if ((i <= 2) && (DriversOnly == TRUE))
+            if ((i <= 2) && (DriversOnly != FALSE))
             {
                 /* Skip it */
                 NextEntry = NextEntry->Flink;
diff --git a/reactos/ntoskrnl/ke/i386/exp.c b/reactos/ntoskrnl/ke/i386/exp.c
index 6d3151ffdc3..7d0ff083efa 100644
--- a/reactos/ntoskrnl/ke/i386/exp.c
+++ b/reactos/ntoskrnl/ke/i386/exp.c
@@ -898,7 +898,7 @@ KiDispatchException(IN PEXCEPTION_RECORD ExceptionRecord,
     if (PreviousMode == KernelMode)
     {
         /* Check if this is a first-chance exception */
-        if (FirstChance == TRUE)
+        if (FirstChance != FALSE)
         {
             /* Break into the debugger for the first time */
             if (KiDebugRoutine(TrapFrame,
diff --git a/reactos/ntoskrnl/mm/ARM3/pfnlist.c b/reactos/ntoskrnl/mm/ARM3/pfnlist.c
index aa7cfbe1f92..959f2612a2c 100644
--- a/reactos/ntoskrnl/mm/ARM3/pfnlist.c
+++ b/reactos/ntoskrnl/mm/ARM3/pfnlist.c
@@ -1183,7 +1183,7 @@ MiDecrementShareCount(IN PMMPFN Pfn1,
         if (Pfn1->u3.e2.ReferenceCount == 1)
         {
             /* Is there still a PFN for this page? */
-            if (MI_IS_PFN_DELETED(Pfn1) == TRUE)
+            if (MI_IS_PFN_DELETED(Pfn1))
             {
                 /* Clear the last reference */
                 Pfn1->u3.e2.ReferenceCount = 0;
diff --git a/reactos/ntoskrnl/mm/ARM3/session.c b/reactos/ntoskrnl/mm/ARM3/session.c
index f0202841042..a0a23f20aa4 100644
--- a/reactos/ntoskrnl/mm/ARM3/session.c
+++ b/reactos/ntoskrnl/mm/ARM3/session.c
@@ -519,7 +519,7 @@ MiSessionInitializeWorkingSetList(VOID)
     OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
 
     /* Check if we need a page table */
-    if (AllocatedPageTable == TRUE)
+    if (AllocatedPageTable != FALSE)
     {
         /* Get a zeroed colored zero page */
         Color = MI_GET_NEXT_COLOR();
diff --git a/reactos/ntoskrnl/se/priv.c b/reactos/ntoskrnl/se/priv.c
index 9014fa895a1..2426dc435fd 100644
--- a/reactos/ntoskrnl/se/priv.c
+++ b/reactos/ntoskrnl/se/priv.c
@@ -446,7 +446,7 @@ SeAppendPrivileges(IN OUT PACCESS_STATE AccessState,
         PrivilegeSet->PrivilegeCount += Privileges->PrivilegeCount;
 
         /* Free the old privilege set if it was allocated */
-        if (AccessState->PrivilegesAllocated == TRUE)
+        if (AccessState->PrivilegesAllocated != FALSE)
             ExFreePool(AuxData->PrivilegeSet);
 
         /* Now we are using an allocated privilege set */