diff --git a/ntoskrnl/kdbg/kdb_cli.c b/ntoskrnl/kdbg/kdb_cli.c
index c86b770c81d..584fb2c4be1 100644
--- a/ntoskrnl/kdbg/kdb_cli.c
+++ b/ntoskrnl/kdbg/kdb_cli.c
@@ -539,7 +539,7 @@ KdbpPrintStructInternal
     ULONG i;
     ULONGLONG Result;
     PROSSYM_AGGREGATE_MEMBER Member;
-    ULONG IndentLen = strlen(Indent);
+    ULONG IndentLen = (ULONG)strlen(Indent);
     ROSSYM_AGGREGATE MemberAggregate = {0 };
 
     for (i = 0; i < Aggregate->NumElements; i++) {
@@ -646,7 +646,7 @@ KdbpCmdPrintStruct(
         DPRINT("Trying to get expression\n");
         for (i = 3; i < Argc - 1; i++)
         {
-            len = strlen(Argv[i]);
+            len = (ULONG)strlen(Argv[i]);
             Argv[i][len] = ' ';
         }
 
diff --git a/sdk/lib/rtl/actctx.c b/sdk/lib/rtl/actctx.c
index d4768428d81..59eaedefbdc 100644
--- a/sdk/lib/rtl/actctx.c
+++ b/sdk/lib/rtl/actctx.c
@@ -1272,7 +1272,7 @@ static BOOL set_error( xmlbuf_t *xmlbuf )
 
 static BOOL is_xmlns_attr( const struct xml_attr *attr )
 {
-    const int len = wcslen( xmlnsW );
+    const int len = (int)wcslen( xmlnsW );
     if (attr->name.len < len) return FALSE;
     if (wcsncmp( attr->name.ptr, xmlnsW, len )) return FALSE;
     return (attr->name.len == len || attr->name.ptr[len] == ':');
@@ -1280,7 +1280,7 @@ static BOOL is_xmlns_attr( const struct xml_attr *attr )
 
 static void push_xmlns( xmlbuf_t *xmlbuf, const struct xml_attr *attr )
 {
-    const int len = wcslen( xmlnsW );
+    const int len = (int)wcslen( xmlnsW );
     struct xml_attr *ns;
 
     if (xmlbuf->ns_pos == MAX_NAMESPACES - 1)
@@ -3789,7 +3789,7 @@ static NTSTATUS build_wndclass_section(ACTIVATION_CONTEXT* actctx, struct strsec
                 struct entity *entity = &dll->entities.base[k];
                 if (entity->kind == ACTIVATION_CONTEXT_SECTION_WINDOW_CLASS_REDIRECTION)
                 {
-                    int class_len = wcslen(entity->u.class.name) + 1;
+                    int class_len = (int)wcslen(entity->u.class.name) + 1;
                     int len;
 
                     /* each class entry needs index, data and string data */
diff --git a/win32ss/printing/base/winspool/printers.c b/win32ss/printing/base/winspool/printers.c
index 8e10c2e682e..a8410561225 100644
--- a/win32ss/printing/base/winspool/printers.c
+++ b/win32ss/printing/base/winspool/printers.c
@@ -3075,7 +3075,7 @@ SetDefaultPrinterW(LPCWSTR pszPrinter)
             goto Cleanup;
         }
 
-        cchPrinter = wcslen(pszPrinter);
+        cchPrinter = (DWORD)wcslen(pszPrinter);
     }
     else
     {
diff --git a/win32ss/printing/providers/localspl/monitors.c b/win32ss/printing/providers/localspl/monitors.c
index 80c52f51ca8..7cff1224a23 100644
--- a/win32ss/printing/providers/localspl/monitors.c
+++ b/win32ss/printing/providers/localspl/monitors.c
@@ -504,7 +504,7 @@ AddPrintMonitorList( LPCWSTR pName, LPWSTR DllName )
         goto Cleanup;
     }
 
-    cchPrintMonitorName = wcslen(pPrintMonitor->pwszName);
+    cchPrintMonitorName = (DWORD)wcslen(pPrintMonitor->pwszName);
 
     if ( DllName == NULL )
     {
diff --git a/win32ss/printing/providers/localspl/printingthread.c b/win32ss/printing/providers/localspl/printingthread.c
index b29d186c14a..b29534b519d 100644
--- a/win32ss/printing/providers/localspl/printingthread.c
+++ b/win32ss/printing/providers/localspl/printingthread.c
@@ -68,7 +68,7 @@ PrintingThreadProc(PLOCAL_JOB pJob)
     pJob->hPrintProcessor = hPrintProcessor;
 
     // Prepare the pDocumentName parameter.
-    cchPrinterName = wcslen(OpenData.pPrinterName);
+    cchPrinterName = (DWORD)wcslen(OpenData.pPrinterName);
     pwszPrinterAndJob = DllAllocSplMem((cchPrinterName + cchJobAppendix + cchMaxJobIdDigits + 1) * sizeof(WCHAR));
     if (!pwszPrinterAndJob)
     {