diff --git a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
index 2646c5c5808..b02b2e779c0 100644
--- a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
@@ -372,9 +372,9 @@ CMakeConfig CMakeConfig::fromFile(const Utils::FilePath &cacheFile, QString *err
             continue;
 
         QTC_ASSERT(pieces.size() == 3, continue);
-        const QByteArray key = pieces.at(0);
-        const QByteArray type = pieces.at(1);
-        const QByteArray value = pieces.at(2);
+        const QByteArray &key = pieces.at(0);
+        const QByteArray &type = pieces.at(1);
+        const QByteArray &value = pieces.at(2);
 
         if (key.endsWith("-ADVANCED") && value == "1") {
             advancedSet.insert(key.left(key.size() - 9 /* "-ADVANCED" */));
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
index 583729ee933..74d5056bf78 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp
@@ -1085,7 +1085,7 @@ void CMakeProjectImporter::persistTemporaryCMake(Kit *k, const QVariantList &vl)
     if (vl.isEmpty())
         return; // No temporary CMake
     QTC_ASSERT(vl.count() == 1, return);
-    const QVariant data = vl.at(0);
+    const QVariant &data = vl.at(0);
     CMakeTool *tmpCmake = CMakeToolManager::findById(Id::fromSetting(data));
     CMakeTool *actualCmake = CMakeKitAspect::cmakeTool(k);
 
diff --git a/src/plugins/cmakeprojectmanager/cmaketool.cpp b/src/plugins/cmakeprojectmanager/cmaketool.cpp
index e50cecc821b..f9d7149a344 100644
--- a/src/plugins/cmakeprojectmanager/cmaketool.cpp
+++ b/src/plugins/cmakeprojectmanager/cmaketool.cpp
@@ -490,7 +490,7 @@ void CMakeTool::parseFunctionDetailsOutput(const QString &output)
 
     const QStringList lines = output.split('\n');
     for (int i = 0; i < lines.count(); ++i) {
-        const QString line = lines.at(i);
+        const QString &line = lines.at(i);
 
         if (line == "::") {
             expectDefinition = true;