diff --git a/src/shared/proparser/qmakeevaluator.cpp b/src/shared/proparser/qmakeevaluator.cpp
index 84f971b0cd2..00c87a7a23c 100644
--- a/src/shared/proparser/qmakeevaluator.cpp
+++ b/src/shared/proparser/qmakeevaluator.cpp
@@ -1529,7 +1529,7 @@ void QMakeEvaluator::updateFeaturePaths()
     feature_roots += m_option->getPathListEnv(QLatin1String("QMAKEFEATURES"));
     feature_roots += m_qmakefeatures;
     feature_roots += m_option->splitPathList(
-                m_option->propertyValue(ProKey("QMAKEFEATURES")).toQString(m_mtmp));
+                m_option->propertyValue(ProKey("QMAKEFEATURES")).toQString());
 
     QStringList feature_bases;
     if (!m_buildRoot.isEmpty()) {
diff --git a/src/shared/proparser/qmakeevaluator.h b/src/shared/proparser/qmakeevaluator.h
index 21e13451d66..7e1911501bb 100644
--- a/src/shared/proparser/qmakeevaluator.h
+++ b/src/shared/proparser/qmakeevaluator.h
@@ -303,7 +303,6 @@ public:
     ProStringList m_returnValue;
     ProValueMapStack m_valuemapStack; // VariableName must be us-ascii, the content however can be non-us-ascii.
     QString m_tmp1, m_tmp2, m_tmp3, m_tmp[2]; // Temporaries for efficient toQString
-    mutable QString m_mtmp;
 
     QMakeGlobals *m_option;
     QMakeParser *m_parser;