diff --git a/cocos/2d/CCFontAtlas.h b/cocos/2d/CCFontAtlas.h
index ecf1287b87..73eb643ef9 100644
--- a/cocos/2d/CCFontAtlas.h
+++ b/cocos/2d/CCFontAtlas.h
@@ -27,6 +27,7 @@
 
 #include "base/CCPlatformMacros.h"
 #include "base/CCRef.h"
+#include "CCStdC.h" // ssize_t on windows
 #include <string>
 #include <unordered_map>
 
diff --git a/cocos/2d/CCTweenFunction.cpp b/cocos/2d/CCTweenFunction.cpp
index 46fef8804b..3432469d17 100644
--- a/cocos/2d/CCTweenFunction.cpp
+++ b/cocos/2d/CCTweenFunction.cpp
@@ -23,7 +23,10 @@ THE SOFTWARE.
 ****************************************************************************/
 
 #include "2d/CCTweenFunction.h"
+
+#define _USE_MATH_DEFINES // needed for M_PI and M_PI2
 #include <math.h> // M_PI
+#undef _USE_MATH_DEFINES
 
 NS_CC_BEGIN