diff --git a/qmake/library/qmakeevaluator.cpp b/qmake/library/qmakeevaluator.cpp
index a1c2b5fcea..73ea10daf8 100644
--- a/qmake/library/qmakeevaluator.cpp
+++ b/qmake/library/qmakeevaluator.cpp
@@ -452,7 +452,7 @@ void QMakeEvaluator::evaluateExpression(
             break; }
         case TokEnvVar: {
             const ProString &var = pro->getStr(tokPtr);
-            const ProString &val = ProString(m_option->getEnv(var.toQString(m_tmp1)));
+            const ProString &val = ProString(m_option->getEnv(var.toQString()));
             debugMsg(2, "env var %s => %s", dbgStr(var), dbgStr(val));
             addStr(val, ret, pending, joined);
             break; }