diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 333bcce81..da579dbd2 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -1864,7 +1864,7 @@ void cmLocalVisualStudio7GeneratorOptions::HandleFlag(const char* flag)
           }
 
         // If the entry was found the flag has been handled.
-        flag_handled |= entry_found;
+        flag_handled = flag_handled || entry_found;
         }
 
       // If any map entry handled the flag we are done.