diff --git a/Source/cmListFileCache.h b/Source/cmListFileCache.h
index 1a5821aac..de0e4fbbf 100644
--- a/Source/cmListFileCache.h
+++ b/Source/cmListFileCache.h
@@ -58,6 +58,10 @@ struct cmListFileFunction
 
 struct cmListFile
 {
+  cmListFile() 
+    :m_ModifiedTime(0) 
+    {
+    }
   long int m_ModifiedTime;
   std::vector<cmListFileFunction> m_Functions;
 };