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--- src/rwpng.c
+++ src/rwpng.c
@@ -31,8 +31,9 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <zlib.h>
 
-#include "png.h"        /* libpng header; includes zlib.h */
+#include "png.h"        /* libpng header */
 #include "rwpng.h"      /* typedefs, common macros, public prototypes */
 
 /* future versions of libpng will provide this macro: */