diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index cd2143dbf99..8046b14f375 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3985,11 +3985,14 @@ PVOID WINAPI PsGetProcessWow64Process(PEPROCESS process)
 /*********************************************************************
  *           MmCopyVirtualMemory    (NTOSKRNL.@)
  */
-NTSTATUS WINAPI MmCopyVirtualMemory(PEPROCESS fromprocess, PVOID fromaddress, PEPROCESS toprocess,
-                                    PVOID toaddress, SIZE_T bufsize, KPROCESSOR_MODE mode,
-                                    PSIZE_T copied)
+NTSTATUS WINAPI MmCopyVirtualMemory(PEPROCESS fromprocess, void *fromaddress, PEPROCESS toprocess,
+                                    void *toaddress, SIZE_T bufsize, KPROCESSOR_MODE mode,
+                                    SIZE_T *copied)
 {
-    FIXME("stub: %p %p %p %p %lu %d %p\n", fromprocess, fromaddress, toprocess, toaddress, bufsize, mode, copied);
+    FIXME("fromprocess %p, fromaddress %p, toprocess %p, toaddress %p, bufsize %lu, mode %d, copied %p stub.\n",
+            fromprocess, fromaddress, toprocess, toaddress, bufsize, mode, copied);
+
+    *copied = 0;
     return STATUS_NOT_IMPLEMENTED;
 }
 
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 57e4cf4fe53..df30051b405 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -1735,6 +1735,7 @@ PVOID     WINAPI MmAllocateContiguousMemory(SIZE_T,PHYSICAL_ADDRESS);
 PVOID     WINAPI MmAllocateNonCachedMemory(SIZE_T);
 PMDL      WINAPI MmAllocatePagesForMdl(PHYSICAL_ADDRESS,PHYSICAL_ADDRESS,PHYSICAL_ADDRESS,SIZE_T);
 void      WINAPI MmBuildMdlForNonPagedPool(MDL*);
+NTSTATUS  WINAPI MmCopyVirtualMemory(PEPROCESS,void*,PEPROCESS,void*,SIZE_T,KPROCESSOR_MODE,SIZE_T*);
 void      WINAPI MmFreeNonCachedMemory(PVOID,SIZE_T);
 void *    WINAPI MmGetSystemRoutineAddress(UNICODE_STRING*);
 PVOID     WINAPI MmMapLockedPagesSpecifyCache(PMDLX,KPROCESSOR_MODE,MEMORY_CACHING_TYPE,PVOID,ULONG,MM_PAGE_PRIORITY);