diff --git a/src/plugins/projectexplorer/doubletabwidget.cpp b/src/plugins/projectexplorer/doubletabwidget.cpp
index 55817378855..36e93cfb887 100644
--- a/src/plugins/projectexplorer/doubletabwidget.cpp
+++ b/src/plugins/projectexplorer/doubletabwidget.cpp
@@ -35,6 +35,7 @@
 #include <utils/stylehelper.h>
 #include <utils/theme/theme.h>
 
+#include <QDir>
 #include <QRect>
 #include <QPainter>
 #include <QMouseEvent>
@@ -573,3 +574,8 @@ bool DoubleTabWidget::event(QEvent *event)
     }
     return QWidget::event(event);
 }
+
+QString DoubleTabWidget::Tab::displayName() const
+{
+    return nameIsUnique ? name : QDir::toNativeSeparators(fullName);
+}
diff --git a/src/plugins/projectexplorer/doubletabwidget.h b/src/plugins/projectexplorer/doubletabwidget.h
index 4e2e70ec79b..92c23ac54ec 100644
--- a/src/plugins/projectexplorer/doubletabwidget.h
+++ b/src/plugins/projectexplorer/doubletabwidget.h
@@ -80,9 +80,7 @@ private:
         bool nameIsUnique;
         QStringList subTabs;
         int currentSubTab;
-        QString displayName() const {
-            return nameIsUnique ? name : fullName;
-        }
+        QString displayName() const;
     };
     void updateNameIsUniqueAdd(Tab *tab);
     void updateNameIsUniqueRemove(const Tab &tab);