diff --git a/taglib/flac/flacfile.cpp b/taglib/flac/flacfile.cpp
index 775fed90..c85d9590 100644
--- a/taglib/flac/flacfile.cpp
+++ b/taglib/flac/flacfile.cpp
@@ -70,7 +70,8 @@ public:
 
   ~FilePrivate()
   {
-    for(uint i = 0; i < blocks.size(); i++) {
+    uint size = blocks.size();
+    for(uint i = 0; i < size; i++) {
       delete blocks[i];
     }
     delete properties;