diff --git a/source/paint/detail/image_png.hpp b/source/paint/detail/image_png.hpp
index 1696b30a..f3cff150 100644
--- a/source/paint/detail/image_png.hpp
+++ b/source/paint/detail/image_png.hpp
@@ -12,7 +12,6 @@
 #endif
 
 #include <stdio.h>
-#include <cstring>
 
 
 namespace nana