diff --git a/reactos/lib/crtdll/except/abnorter.c b/reactos/lib/crtdll/except/abnorter.c
index b480e72df1b..f6c28cc0d74 100644
--- a/reactos/lib/crtdll/except/abnorter.c
+++ b/reactos/lib/crtdll/except/abnorter.c
@@ -1,5 +1,5 @@
 #include <windows.h>
-#include <msvcrt\stdio.h>
+#include <msvcrt/stdio.h>
 
 #ifdef __GNUC__
 
diff --git a/reactos/lib/zlib/Makefile b/reactos/lib/zlib/Makefile
index 6ab42cc7fa1..a272c699c73 100644
--- a/reactos/lib/zlib/Makefile
+++ b/reactos/lib/zlib/Makefile
@@ -1,4 +1,4 @@
-# $Id: Makefile,v 1.5 2003/08/07 04:03:24 royce Exp $
+# $Id: Makefile,v 1.6 2003/11/19 05:47:28 vizzini Exp $
 
 PATH_TO_TOP = ../..
 
@@ -8,7 +8,7 @@ TARGET_NAME = zlib
 
 TARGET_CFLAGS = \
  -MMD -O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
- -Wstrict-prototypes -Wmissing-prototypes
+ -Wstrict-prototypes -Wmissing-prototypes -Werror
 
 # require os code to explicitly request A/W version of structs/functions
 TARGET_CFLAGS += -D_DISABLE_TIDENTS