diff --git a/src/libs/utils/filepath.cpp b/src/libs/utils/filepath.cpp
index dcc5c6fac6a..e5e4b97cd3e 100644
--- a/src/libs/utils/filepath.cpp
+++ b/src/libs/utils/filepath.cpp
@@ -911,8 +911,8 @@ FilePath FilePath::fromStringWithExtension(const QString &filepath, const QStrin
     const QChar dot = QLatin1Char('.');
     if (!rc.fileName().contains(dot)) {
         if (!defaultExtension.startsWith(dot))
-            rc.stringAppended(dot);
-        rc.stringAppended(defaultExtension);
+            rc = rc.stringAppended(dot);
+        rc = rc.stringAppended(defaultExtension);
     }
     return rc;
 }