diff --git a/backend/png.c b/backend/png.c
index c5356356..7f83237f 100644
--- a/backend/png.c
+++ b/backend/png.c
@@ -44,7 +44,9 @@
 #endif /* _MSC_VER */
 
 #ifndef NO_PNG
-#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include <png.h>
+#include <zlib.h>
+#include <setjmp.h>
 #endif /* NO_PNG */
 #include "maxipng.h"	/* Maxicode shapes */