diff --git a/cocos/renderer/CCTexture2D.cpp b/cocos/renderer/CCTexture2D.cpp
index 499b2d5f83..3c7ff09591 100644
--- a/cocos/renderer/CCTexture2D.cpp
+++ b/cocos/renderer/CCTexture2D.cpp
@@ -335,6 +335,8 @@ bool Texture2D::updateWithImage(Image* image, backend::PixelFormat format, int i
     }
 
     _flagsAndFormatEXT |= formatEXT;
+
+    // pitfall: because we do merge etc1 alpha at shader, so must mark as _hasPremultipliedAlpha = true to makesure alpha blend works well.
     if (formatEXT == TextureFormatEXT::ETC1_ALPHA)
         setPremultipliedAlpha(true);
 
diff --git a/cocos/renderer/CCTextureCache.cpp b/cocos/renderer/CCTextureCache.cpp
index e7f69da981..910f3e2371 100644
--- a/cocos/renderer/CCTextureCache.cpp
+++ b/cocos/renderer/CCTextureCache.cpp
@@ -419,8 +419,7 @@ Texture2D * TextureCache::addImage(const std::string &path)
                 {
                     Image imageAlpha;
                     if (imageAlpha.initWithImageFile(alphaFullPath))
-                    {   // pitfall: because we do merge etc1 alpha at shader, so must mark as _hasPremultipliedAlpha=true to makesure alpha blend works well.
-                        //   the Premultiply operation can only do at shader.
+                    {
                         texture->updateWithImage(&imageAlpha, Texture2D::getDefaultAlphaPixelFormat(), 1, TextureFormatEXT::ETC1_ALPHA);
                     }
                 }
@@ -830,8 +829,11 @@ void VolatileTextureMgr::reloadAllTextures()
             reloadTexture(vt->_texture, vt->_fileName, vt->_pixelFormat);
 
             // etc1 support check whether alpha texture exists & load it
-            auto alphaFile = vt->_fileName + TextureCache::getETC1AlphaFileSuffix();
-            reloadTexture(vt->_texture->getAlphaTexture(), alphaFile, vt->_pixelFormat);
+            Image image;
+            if (image.initWithImageFile(vt->_fileName + TextureCache::getETC1AlphaFileSuffix()))
+            {
+                vt->_texture->updateWithImage(&image, vt->_pixelFormat, 1, TextureFormatEXT::ETC1_ALPHA);
+            }
         }
         break;
         case VolatileTexture::kImageData:
diff --git a/cocos/renderer/backend/opengl/TextureGL.h b/cocos/renderer/backend/opengl/TextureGL.h
index 6372502042..6a6608e2c7 100644
--- a/cocos/renderer/backend/opengl/TextureGL.h
+++ b/cocos/renderer/backend/opengl/TextureGL.h
@@ -226,7 +226,7 @@ public:
      */
     void apply(int index) const;
 
-    int getCount() const { return 1; }
+    int getCount() const override { return 1; }
 
 private:
     void setTexParameters();