diff --git a/frogatto/src/IMG_savepng.h b/frogatto/src/IMG_savepng.h
index 310fdc4..d497ec0 100644
--- a/frogatto/src/IMG_savepng.h
+++ b/frogatto/src/IMG_savepng.h
@@ -25,6 +25,7 @@
 #define __IMG_SAVETOPNG_H__
 
 #include <SDL.h>
+#include <zlib.h>
 
 #define IMG_COMPRESS_OFF 0
 #define IMG_COMPRESS_MAX 9