diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d05f4a5..16ed83a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -233,6 +233,7 @@ ENDIF(CMAKE_ASM_COMPILER_LOADED AND USE_ASM_SCALERS)
 
 INCLUDE_DIRECTORIES(
     ${ZLIB_INCLUDE_DIR}
+    ${PNG_INCLUDE_DIR}
     ${SDL_INCLUDE_DIR}
 )