diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 2d960626750e..62a24e742be6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -227,7 +227,7 @@ all:
 		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET	\
 				O=$(abs_objtree)		\
 				$(if $(FORCE_TARGETS),|| exit);	\
-		ret=$$((ret * $$?));				\
+		[ $$? -eq 0 ] && ret=0;				\
 	done; exit $$ret;
 
 run_tests: all
@@ -294,7 +294,7 @@ ifdef INSTALL_PATH
 				OBJ_PATH=$(INSTALL_PATH) \
 				O=$(abs_objtree)		\
 				$(if $(FORCE_TARGETS),|| exit);	\
-		ret=$$((ret * $$?));		\
+		[ $$? -eq 0 ] && ret=0;		\
 	done; exit $$ret;