diff --git a/Source/CTest/cmCTestVC.cxx b/Source/CTest/cmCTestVC.cxx
index cb4aa2d25..ccc6fcb4f 100644
--- a/Source/CTest/cmCTestVC.cxx
+++ b/Source/CTest/cmCTestVC.cxx
@@ -86,7 +86,7 @@ std::string cmCTestVC::GetNightlyTime()
           t->tm_hour,
           t->tm_min,
           t->tm_sec);
-  return current_time;
+  return std::string(current_time);
 }
 
 //----------------------------------------------------------------------------