diff --git a/src/plugins/qt4projectmanager/qt4buildconfiguration.cpp b/src/plugins/qt4projectmanager/qt4buildconfiguration.cpp
index df7868fa812..fe67771a154 100644
--- a/src/plugins/qt4projectmanager/qt4buildconfiguration.cpp
+++ b/src/plugins/qt4projectmanager/qt4buildconfiguration.cpp
@@ -459,11 +459,11 @@ MakeStep *Qt4BuildConfiguration::makeStep() const
 
 void Qt4BuildConfiguration::qtVersionsChanged(const QList<int> &changedVersions)
 {
-    if (!changedVersions.contains(m_qtVersionId) ||
-        qtVersion()->isValid())
+    if (!changedVersions.contains(m_qtVersionId))
         return;
-
-    pickValidQtVersion();
+    if (!qtVersion()->isValid())
+        pickValidQtVersion();
+    emit environmentChanged(); // Our qt version changed, that might have changed the environemnt
 }
 
 // returns true if both are equal