diff --git a/base/services/dhcpcsvc/dhcp/api.c b/base/services/dhcpcsvc/dhcp/api.c
index 2a63682d00a..f9bc794cee3 100644
--- a/base/services/dhcpcsvc/dhcp/api.c
+++ b/base/services/dhcpcsvc/dhcp/api.c
@@ -347,3 +347,20 @@ Server_RemoveDNSRegistrations(
     /* FIXME: Call dnsapi.DnsRemoveRegistrations() */
     return ERROR_SUCCESS;
 }
+
+
+/* Function 7 */
+DWORD
+__stdcall
+Server_RequestParams(
+    _In_ PDHCP_SERVER_NAME ServerName,
+    _In_ LPWSTR AdapterName,
+    _In_ DHCPCAPI_CLASSID *ClassId,
+    _In_ DWORD Unknown4,
+    _In_ DWORD Unknown5,
+    _In_ DWORD Unknown6)
+{
+    DPRINT1("Server_RequestParams(%S %p)\n", AdapterName, ClassId);
+    UNIMPLEMENTED;
+    return ERROR_SUCCESS;
+}
diff --git a/base/services/dhcpcsvc/dhcpcsvc.c b/base/services/dhcpcsvc/dhcpcsvc.c
index e6894995f90..97ce6f500df 100644
--- a/base/services/dhcpcsvc/dhcpcsvc.c
+++ b/base/services/dhcpcsvc/dhcpcsvc.c
@@ -601,7 +601,7 @@ DhcpReleaseParameters(
  * \return ERROR_SUCCESS on success
  */
 DWORD
-WINAPI
+APIENTRY
 DhcpRemoveDNSRegistrations(VOID)
 {
     DWORD ret;
@@ -621,6 +621,55 @@ DhcpRemoveDNSRegistrations(VOID)
     return ret;
 }
 
+DWORD
+APIENTRY
+DhcpRequestParams(
+    _In_ DWORD Flags,
+    _In_ PVOID Reserved,
+    _In_ LPWSTR AdapterName,
+    _In_ LPDHCPCAPI_CLASSID ClassId,
+    _In_ DHCPCAPI_PARAMS_ARRAY SendParams,
+    _Inout_ DHCPCAPI_PARAMS_ARRAY RecdParams,
+    _In_ LPBYTE Buffer,
+    _Inout_ LPDWORD pSize,
+    _In_ LPWSTR RequestIdStr)
+{
+    DWORD ret = ERROR_SUCCESS;
+
+    DPRINT1("DhcpRequestParams(%lx %p %S %p %p %p %p %p %S)\n",
+            Flags, Reserved, AdapterName, ClassId, SendParams,
+            RecdParams, Buffer, pSize, RequestIdStr);
+
+    if ((Reserved != NULL) || (AdapterName == NULL))
+        return ERROR_INVALID_PARAMETER;
+
+    if (ClassId != NULL)
+    {
+        if (ClassId->Flags != 0)
+            return ERROR_INVALID_PARAMETER;
+
+        if ((ClassId->Data == NULL) || (ClassId->nBytesData == 0))
+            return ERROR_INVALID_PARAMETER;
+    }
+
+    RpcTryExcept
+    {
+        ret = Client_RequestParams(NULL,
+                                   AdapterName,
+                                   ClassId,
+                                   0,
+                                   0,
+                                   0);
+    }
+    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
+    {
+        ret = I_RpcMapWin32Status(RpcExceptionCode());
+    }
+    RpcEndExcept;
+
+    return ret;
+}
+
 DWORD
 APIENTRY
 DhcpStaticRefreshParams(DWORD AdapterIndex,
@@ -644,20 +693,22 @@ DhcpStaticRefreshParams(DWORD AdapterIndex,
     return (ret == ERROR_SUCCESS) ? 1 : 0;
 }
 
-
-DWORD APIENTRY
-DhcpRequestParams(DWORD Flags,
-                  PVOID Reserved,
-                  LPWSTR AdapterName,
-                  LPDHCPCAPI_CLASSID ClassId,
-                  DHCPCAPI_PARAMS_ARRAY SendParams,
-                  DHCPCAPI_PARAMS_ARRAY RecdParams,
-                  LPBYTE Buffer,
-                  LPDWORD pSize,
-                  LPWSTR RequestIdStr)
+DWORD
+APIENTRY
+DhcpUndoRequestParams(
+    _In_ DWORD  Flags,
+    _In_ LPVOID Reserved,
+    _In_ LPWSTR AdapterName,
+    _In_ LPWSTR RequestIdStr)
 {
+    DPRINT1("DhcpUndoRequestParams(%lx %p %S %S)\n",
+            Flags, Reserved, AdapterName, RequestIdStr);
+
+    if ((Flags != 0) || (Reserved != NULL) || (RequestIdStr == NULL))
+        return ERROR_INVALID_PARAMETER;
+
     UNIMPLEMENTED;
-    return 0;
+    return STATUS_SUCCESS;
 }
 
 static VOID
diff --git a/base/services/dhcpcsvc/dhcpcsvc.spec b/base/services/dhcpcsvc/dhcpcsvc.spec
index 7843b41b671..5d70c377276 100644
--- a/base/services/dhcpcsvc/dhcpcsvc.spec
+++ b/base/services/dhcpcsvc/dhcpcsvc.spec
@@ -34,7 +34,7 @@
 @ stub DhcpRequestOptions
 @ stdcall DhcpRequestParams(long ptr ptr ptr long ptr long ptr ptr ptr ptr)
 @ stdcall DhcpStaticRefreshParams(long long long)
-@ stub DhcpUndoRequestParams
+@ stdcall DhcpUndoRequestParams(long ptr wstr wstr)
 @ stub McastApiCleanup
 @ stub McastApiStartup
 @ stub McastEnumerateScopes
diff --git a/sdk/include/psdk/dhcpcsdk.h b/sdk/include/psdk/dhcpcsdk.h
index 6a4b64faea8..6fefc57b2e2 100644
--- a/sdk/include/psdk/dhcpcsdk.h
+++ b/sdk/include/psdk/dhcpcsdk.h
@@ -92,7 +92,11 @@ typedef struct _DHCPAPI_PARAMS
     ULONG  Flags;
     ULONG  OptionId;
     BOOL   IsVendor;
-    BYTE   *Data;
+#if defined(__midl) || defined(__WIDL__)
+    [size_is(nBytesData), unique] LPBYTE Data;
+#else
+    LPBYTE Data;
+#endif
     DWORD  nBytesData;
 } DHCPAPI_PARAMS, *PDHCPAPI_PARAMS, *LPDHCPAPI_PARAMS;
 
@@ -101,13 +105,21 @@ typedef struct _DHCPAPI_PARAMS DHCPCAPI_PARAMS, *PDHCPCAPI_PARAMS, *LPDHCPCAPI_P
 typedef struct _DHCPCAPI_PARAMS_ARARAY
 {
     ULONG             nParams;
+#if defined(__midl) || defined(__WIDL__)
+    [size_is(nParams), unique] LPDHCPCAPI_PARAMS Params;
+#else
     LPDHCPCAPI_PARAMS Params;
+#endif
 } DHCPCAPI_PARAMS_ARRAY, *PDHCPCAPI_PARAMS_ARRAY, *LPDHCPCAPI_PARAMS_ARRAY;
 
 typedef struct _DHCPCAPI_CLASSID
 {
     ULONG  Flags;
-    BYTE   *Data;
+#if defined(__midl) || defined(__WIDL__)
+    [size_is(nBytesData), unique] LPBYTE Data;
+#else
+    LPBYTE Data;
+#endif
     ULONG  nBytesData;
 } DHCPCAPI_CLASSID, *PDHCPCAPI_CLASSID, *LPDHCPCAPI_CLASSID;
 
@@ -117,6 +129,7 @@ typedef struct _DHCPCAPI_CLASSID
 #define DHCPCAPI_REQUEST_CANCEL       0x8
 #define DHCPCAPI_REQUEST_MASK         0xf
 
+#if !defined(__midl) && !defined(__WIDL__)
 void WINAPI DhcpCApiCleanup(void);
 DWORD WINAPI DhcpCApiInitialize(DWORD *);
 DWORD WINAPI DhcpDeRegisterParamChange(DWORD, void *, void *);
@@ -125,5 +138,6 @@ DWORD WINAPI DhcpRemoveDNSRegistrations(VOID);
 DWORD WINAPI DhcpRequestParams(DWORD, void *, WCHAR *, DHCPCAPI_CLASSID *, DHCPCAPI_PARAMS_ARRAY,
                                DHCPCAPI_PARAMS_ARRAY, BYTE *, DWORD *, WCHAR *);
 DWORD WINAPI DhcpUndoRequestParams(DWORD, LPVOID, LPWSTR, LPWSTR);
+#endif
 
 #endif
diff --git a/sdk/include/reactos/idl/dhcpcsvc.idl b/sdk/include/reactos/idl/dhcpcsvc.idl
index bc4289b55ec..4db71233a57 100644
--- a/sdk/include/reactos/idl/dhcpcsvc.idl
+++ b/sdk/include/reactos/idl/dhcpcsvc.idl
@@ -6,6 +6,19 @@
 
 typedef [handle] wchar_t *PDHCP_SERVER_NAME;
 
+cpp_quote("#ifndef _DHCPCSDK_")
+typedef struct _DHCPCAPI_CLASSID
+{
+    ULONG  Flags;
+#if defined(__midl) || defined(__WIDL__)
+    [size_is(nBytesData), unique] LPBYTE Data;
+#else
+    LPBYTE Data;
+#endif
+    ULONG  nBytesData;
+} DHCPCAPI_CLASSID, *PDHCPCAPI_CLASSID, *LPDHCPCAPI_CLASSID;
+cpp_quote("#endif")
+
 [
     uuid(4D5839D6-01BC-559C-B2EC-7DF12EC1B7E6),
     version(0.0),
@@ -70,4 +83,15 @@ interface dhcpcsvc
     __stdcall
     RemoveDNSRegistrations(
         [in, string, unique] PDHCP_SERVER_NAME ServerName);
+
+    /* Function 7 */
+    DWORD
+    __stdcall
+    RequestParams(
+        [in, unique, string] PDHCP_SERVER_NAME ServerName,
+        [in, string] LPWSTR AdapterName,
+        [in, unique] DHCPCAPI_CLASSID *ClassId,
+        [in] DWORD Unknown4,
+        [in] DWORD Unknown5,
+        [in] DWORD Unknown6);
 }