1 files changed, 1 insertions, 1 deletions

diff --git a/zutil.h b/zutil.h
index 7be5f55..4e3dcc6 100644
--- a/zutil.h
+++ b/zutil.h
@@ -13,7 +13,7 @@
 #ifndef ZUTIL_H
 #define ZUTIL_H
 
-#if ((__GNUC__-0) * 100 + __GNUC_MINOR__-0) >= 303 && !defined(NO_VIZ)
+#ifdef HAVE_HIDDEN
 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
 #else
 #  define ZLIB_INTERNAL