diff --git a/src/plugins/qt4projectmanager/qtversionmanager.cpp b/src/plugins/qt4projectmanager/qtversionmanager.cpp
index 07e5a33bea0..a0680c44589 100644
--- a/src/plugins/qt4projectmanager/qtversionmanager.cpp
+++ b/src/plugins/qt4projectmanager/qtversionmanager.cpp
@@ -501,6 +501,7 @@ void QtVersion::updateSourcePath()
             }
         }
     }
+    m_sourcePath = QDir::cleanPath(m_sourcePath);
 }
 
 // Returns the version that was used to build the project in that directory