diff --git a/cocos/2d/platform/CCImage.cpp b/cocos/2d/platform/CCImage.cpp
index 4a991c8939..324c525730 100644
--- a/cocos/2d/platform/CCImage.cpp
+++ b/cocos/2d/platform/CCImage.cpp
@@ -2023,7 +2023,7 @@ bool Image::saveImageToPNG(const std::string& filePath, bool isToRGB)
         {
             if (isToRGB)
             {
-                unsigned char *pTempData = static_cast<unsigned char*>(malloc(_width * _height * 3 * sizeof(unsigned char*)));
+                unsigned char *pTempData = static_cast<unsigned char*>(malloc(_width * _height * 3 * sizeof(unsigned char)));
                 if (nullptr == pTempData)
                 {
                     fclose(fp);