diff --git a/Makefile b/Makefile
index 42eefd6..7e28f4b 100644
--- a/Makefile
+++ b/Makefile
@@ -127,7 +127,7 @@ export OUTPUT	:=	$(CURDIR)/$(TARGET)
 
 #---------------------------------------------------------------------------------
 $(BUILD):
-	@[ -d $@ ] || mkdir -p $@
+	@$(shell [ ! -d $(BUILD) ] && mkdir -p $(BUILD))
 	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile