diff --git a/src/corelib/io/qlockfile_unix.cpp b/src/corelib/io/qlockfile_unix.cpp
index 5a02741727..ccc607afd5 100644
--- a/src/corelib/io/qlockfile_unix.cpp
+++ b/src/corelib/io/qlockfile_unix.cpp
@@ -115,6 +115,7 @@ int QLockFilePrivate::checkFcntlWorksAfterFlock(const QString &fn)
         return 0;
     return 1;
 #else
+    Q_UNUSED(fn);
     return 0;
 #endif
 }