diff --git a/Source/Script/Unix/zlib.sh b/Source/Script/Unix/zlib.sh
index 5cf6d3210..8a19859a1 100755
--- a/Source/Script/Unix/zlib.sh
+++ b/Source/Script/Unix/zlib.sh
@@ -6,6 +6,8 @@ mkdir -p $obj/contrib/minizip
 FLAGS_x86="\
  -S \
  -fPIC \
+ -Wall \
+ -pedantic \
  -masm=intel \
  -march=native \
  -Os"