diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 00b29db8cb5..382feb324a5 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -750,7 +750,7 @@
 # @ stub RtlNtPathNameToDosPathName
 @ stdcall RtlNtStatusToDosError(long)
 @ stdcall RtlNtStatusToDosErrorNoTeb(long)
-@ stub RtlNumberGenericTableElements
+@ stdcall RtlNumberGenericTableElements(ptr)
 # @ stub RtlNumberGenericTableElementsAvl
 @ stdcall RtlNumberOfClearBits(ptr)
 @ stdcall RtlNumberOfSetBits(ptr)
diff --git a/dlls/ntdll/rtl.c b/dlls/ntdll/rtl.c
index 1477a653203..ad4bc10d993 100644
--- a/dlls/ntdll/rtl.c
+++ b/dlls/ntdll/rtl.c
@@ -448,6 +448,15 @@ PVOID RtlEnumerateGenericTableWithoutSplaying(PVOID pTable, PVOID *RestartKey)
     return NULL;
 }
 
+/******************************************************************************
+ *  RtlNumberGenericTableElements           [NTDLL.@]
+ */
+ULONG RtlNumberGenericTableElements(PVOID pTable)
+{
+    FIXME("(%p) stub!\n", pTable);
+    return 0;
+}
+
 /******************************************************************************
  *  RtlMoveMemory   [NTDLL.@]
  *