diff --git a/backend/png.c b/backend/png.c
index d120d4f5..07c84fef 100644
--- a/backend/png.c
+++ b/backend/png.c
@@ -33,7 +33,8 @@
 #endif /* _MSC_VER */
 
 #ifndef NO_PNG
-#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include <zlib.h>
+#include <png.h>
 #endif /* NO_PNG */
 #include "maxipng.h"	/* Maxicode shapes */