diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index e05646929..a016e928e 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -299,7 +299,8 @@ void cmTarget::AddUtility(const std::string& u, cmMakefile *makefile)
 {
   if(this->Utilities.insert(u).second && makefile)
     {
-    UtilityBacktraces.insert(std::make_pair(u, makefile->GetBacktrace()));
+    this->UtilityBacktraces.insert(
+            std::make_pair(u, makefile->GetBacktrace()));
     }
 }