diff --git a/tests/auto/testlib/selftests/benchlibcallgrind/tst_benchlibcallgrind.cpp b/tests/auto/testlib/selftests/benchlibcallgrind/tst_benchlibcallgrind.cpp
index 8ced6f28e5d..3c9d1a221fa 100644
--- a/tests/auto/testlib/selftests/benchlibcallgrind/tst_benchlibcallgrind.cpp
+++ b/tests/auto/testlib/selftests/benchlibcallgrind/tst_benchlibcallgrind.cpp
@@ -22,7 +22,7 @@ private slots:
 void tst_BenchlibCallgrind::failInChildProcess()
 {
 #ifdef HAVE_VALGRIND_H
-    static double f = 1.0;
+    [[maybe_unused]] static double f = 1.0;
     QBENCHMARK {
         for (int i = 0; i < 1000000; ++i) {
             f *= 1.1;