diff --git a/src/testlib/qtestcase.h b/src/testlib/qtestcase.h
index dffbedab8e..70055a71df 100644
--- a/src/testlib/qtestcase.h
+++ b/src/testlib/qtestcase.h
@@ -209,7 +209,7 @@ namespace QTest
     Q_TESTLIB_EXPORT bool compare_helper(bool success, const char *msg, const char *file,
                                           int line);
     Q_TESTLIB_EXPORT bool compare_helper(bool success, const char *msg, char *val1, char *val2,
-                                         const char *expected, const char *actual,
+                                         const char *actual, const char *expected,
                                          const char *file, int line);
     Q_TESTLIB_EXPORT void qSleep(int ms);
     Q_TESTLIB_EXPORT void addColumnInternal(int id, const char *name);