diff --git a/tests/adc-power/Makefile b/tests/adc-power/Makefile
index 52841cd..8aa770d 100644
--- a/tests/adc-power/Makefile
+++ b/tests/adc-power/Makefile
@@ -9,7 +9,7 @@ all: $(GZ_ALL:=.all)
 clean: $(GZ_ALL:=.clean)
 
 %.all:
-	make -f $* all
+	$(MAKE) -f $* all
 %.clean:
-	make -f $* clean
+	$(MAKE) -f $* clean