diff --git a/vcl/source/bitmap/BlendFrameCache.cxx b/vcl/source/bitmap/BlendFrameCache.cxx
index 126e008f5f39..f233591f0abe 100644
--- a/vcl/source/bitmap/BlendFrameCache.cxx
+++ b/vcl/source/bitmap/BlendFrameCache.cxx
@@ -127,6 +127,9 @@ BlendFrameCache::BlendFrameCache(Size const& rSize, sal_uInt8 nAlpha, Color cons
         }
     }
 
+    pContent.reset();
+    pAlpha.reset();
+
     m_aLastResult = BitmapEx(aContent, aAlpha);
 }