diff --git a/mz_compat_shim.h.in b/mz_compat_shim.h.in
index cf45157e..b5496a6c 100644
--- a/mz_compat_shim.h.in
+++ b/mz_compat_shim.h.in
@@ -4,9 +4,14 @@
    This program is distributed under the terms of the same license as zlib.
    See the accompanying LICENSE file for the full text of the license.
 */
+
 #ifndef @MZ_COMPAT_FILE@
 #define @MZ_COMPAT_FILE@
 
 #include "mz_compat.h"
 
-#endif
\ No newline at end of file
+#ifndef ZLIB_H
+#include "zlib.h"
+#endif
+
+#endif