diff --git a/ditchers/ditcher/src/savepng/IMG_savepng.cpp b/ditchers/ditcher/src/savepng/IMG_savepng.cpp

index c6509b5..85771cb 100644

--- a/ditchers/ditcher/src/savepng/IMG_savepng.cpp

+++ b/ditchers/ditcher/src/savepng/IMG_savepng.cpp

@@ -28,6 +28,7 @@

 #include "SDL.h"

 #include "SDL_byteorder.h"

 #include <png.h>

+#include <zlib.h>

 #include "savepng/IMG_savepng.h"

 int IMG_SavePNG(const char *file, SDL_Surface *surf,int compression){