diff --git a/src/plugins/cmakeprojectmanager/cmaketool.cpp b/src/plugins/cmakeprojectmanager/cmaketool.cpp
index 2a2953e98ed..90bc67fc268 100644
--- a/src/plugins/cmakeprojectmanager/cmaketool.cpp
+++ b/src/plugins/cmakeprojectmanager/cmaketool.cpp
@@ -73,6 +73,8 @@ static QString readerTypeToString(const CMakeTool::ReaderType &type)
     switch (type) {
     case CMakeTool::FileApi:
         return QString(READER_TYPE_FILEAPI);
+    default:
+        return QString();
     }
 }