diff --git a/tools/Config.mk b/tools/Config.mk
index 63f3a3560a6..ec61dfc64f4 100644
--- a/tools/Config.mk
+++ b/tools/Config.mk
@@ -561,6 +561,10 @@ ifeq ($(CONFIG_ARCH_COVERAGE),y)
 	EXTRA = *.gcno *.gcda
 endif
 
+ifeq ($(CONFIG_STACK_USAGE),y)
+	EXTRA += *.su
+endif
+
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
 define CLEAN
 	$(Q) if exist *$(OBJEXT) (del /f /q *$(OBJEXT))