diff --git a/reactos/lib/ntdll/rtl/sid.c b/reactos/lib/ntdll/rtl/sid.c
index b6d6a0b72f3..e848b21c7da 100644
--- a/reactos/lib/ntdll/rtl/sid.c
+++ b/reactos/lib/ntdll/rtl/sid.c
@@ -1,4 +1,4 @@
-/* $Id: sid.c,v 1.2 2000/04/15 23:10:41 ekohl Exp $
+/* $Id: sid.c,v 1.3 2002/06/15 10:10:19 ekohl Exp $
  *
  * COPYRIGHT:         See COPYING in the top level directory
  * PROJECT:           ReactOS kernel
@@ -68,7 +68,7 @@ BOOLEAN STDCALL RtlEqualSid (PSID Sid1, PSID Sid2)
      {
 	return(FALSE);
      }
-   if (memcmp(Sid1, Sid2, RtlLengthSid(Sid1) != 0))
+   if (memcmp(Sid1, Sid2, RtlLengthSid(Sid1)) != 0)
      {
 	return(FALSE);
      }
diff --git a/reactos/ntoskrnl/se/sid.c b/reactos/ntoskrnl/se/sid.c
index 7a65fed36b9..36cbe005359 100644
--- a/reactos/ntoskrnl/se/sid.c
+++ b/reactos/ntoskrnl/se/sid.c
@@ -1,4 +1,4 @@
-/* $Id: sid.c,v 1.8 2002/02/20 20:15:38 ekohl Exp $
+/* $Id: sid.c,v 1.9 2002/06/15 10:10:43 ekohl Exp $
  *
  * COPYRIGHT:         See COPYING in the top level directory
  * PROJECT:           ReactOS kernel
@@ -532,7 +532,7 @@ RtlEqualSid(PSID Sid1,
      {
 	return(FALSE);
      }
-   if (memcmp(Sid1, Sid2, RtlLengthSid(Sid1) != 0))
+   if (memcmp(Sid1, Sid2, RtlLengthSid(Sid1)) != 0)
      {
 	return(FALSE);
      }