diff --git a/Source/QtDialog/QCMake.cxx b/Source/QtDialog/QCMake.cxx
index eaf50f21dc..25432156d2 100644
--- a/Source/QtDialog/QCMake.cxx
+++ b/Source/QtDialog/QCMake.cxx
@@ -484,7 +484,7 @@ void QCMake::setWarnUnusedMode(bool value)
 
 void QCMake::checkOpenPossible()
 {
-  auto data = this->BinaryDirectory.toLocal8Bit().data();
+  std::string data = this->BinaryDirectory.toLocal8Bit().data();
   auto possible = this->CMakeInstance->Open(data, true);
   emit openPossible(possible);
 }