diff --git a/reactos/lib/advapi32/advapi32.def b/reactos/lib/advapi32/advapi32.def
index 6f7059128b4..31f361dc560 100644
--- a/reactos/lib/advapi32/advapi32.def
+++ b/reactos/lib/advapi32/advapi32.def
@@ -414,7 +414,7 @@ MD5Update@12
 MakeAbsoluteSD@44
 ;MakeAbsoluteSD2
 MakeSelfRelativeSD@12
-MapGenericMask@8
+MapGenericMask@8=NTDLL.MapGenericMask
 ;NotifyBootConfigStatus@4
 NotifyChangeEventLog@8
 ObjectCloseAuditAlarmA@12
diff --git a/reactos/lib/advapi32/sec/misc.c b/reactos/lib/advapi32/sec/misc.c
index a3501bc8927..0b8a8198f71 100644
--- a/reactos/lib/advapi32/sec/misc.c
+++ b/reactos/lib/advapi32/sec/misc.c
@@ -335,18 +335,6 @@ SetKernelObjectSecurity(HANDLE Handle,
 }
 
 
-/*
- * @implemented
- */
-VOID STDCALL
-MapGenericMask(PDWORD AccessMask,
-	       PGENERIC_MAPPING GenericMapping)
-{
-  RtlMapGenericMask(AccessMask,
-		    GenericMapping);
-}
-
-
 /*
  * @implemented
  */