diff --git a/src/plugins/qnx/qnxqtversion.h b/src/plugins/qnx/qnxqtversion.h
index 225af67867f..d251fbf6c48 100644
--- a/src/plugins/qnx/qnxqtversion.h
+++ b/src/plugins/qnx/qnxqtversion.h
@@ -81,7 +81,7 @@ private:
     QnxArchitecture m_arch;
     QString m_sdkPath;
 
-    mutable bool m_environmentUpToDate;
+    mutable bool m_environmentUpToDate = false;
     mutable QList<Utils::EnvironmentItem> m_qnxEnv;
 };