diff --git a/src/corelib/tools/qsimd_p.h b/src/corelib/tools/qsimd_p.h
index be003f6c6d..bb9c26f762 100644
--- a/src/corelib/tools/qsimd_p.h
+++ b/src/corelib/tools/qsimd_p.h
@@ -150,7 +150,7 @@
 #    define QT_FUNCTION_TARGET(x)
 #  endif
 #else
-#  define QT_COMPILER_SUPPORTS_HERE(x)    defined(__ ## x ## __)
+#  define QT_COMPILER_SUPPORTS_HERE(x)    (__ ## x ## __)
 #  define QT_FUNCTION_TARGET(x)
 #endif