diff --git a/src/heightmap.cpp b/src/heightmap.cpp
index 6fb0bfe4ce..43f4e0c24d 100644
--- a/src/heightmap.cpp
+++ b/src/heightmap.cpp
@@ -32,7 +32,7 @@ static inline byte RGBToGrayscale(byte red, byte green, byte blue)
 
 #ifdef WITH_PNG
 
-#include "png.h"
+#include <png.h>
 
 /**
  * The PNG Heightmap loader.