diff --git a/tests/auto/debugger/dumpers.pro b/tests/auto/debugger/dumpers.pro
index a22349dc04d..6385f42bbd8 100644
--- a/tests/auto/debugger/dumpers.pro
+++ b/tests/auto/debugger/dumpers.pro
@@ -42,4 +42,4 @@ INCLUDEPATH += $$DEBUGGERDIR
 
 # clang 3.5 does not like to optimize long functions.
 # likewise gcc 5.4
-QMAKE_CXXFLAGS_RELEASE =
+clang|gcc: QMAKE_CXXFLAGS_RELEASE =