Merge commit 'e12fe06'
diff --git a/Makefile b/Makefile
index 13012ad..ba5a624 100644
--- a/Makefile
+++ b/Makefile
@@ -2,10 +2,10 @@
 INSTALL_DIR=$(PREFIX)/include/xbyak
 
 all:
-	make -C sample
+	$(MAKE) -C sample
 
 clean:
-	make -C sample clean
+	$(MAKE) -C sample clean
 
 install:
 	mkdir -p $(INSTALL_DIR)