diff --git a/Makefile b/Makefile
index 7b9afbb..71ec18e 100644
--- a/Makefile
+++ b/Makefile
@@ -4,12 +4,12 @@
 PATH_BIN := bin
 PATH_SRC := src
 PATH_MSXBUILD ?= lib
-MB_PROJ_META_GROUP_ID ?= love.distributedrebirth.msx4.firemake.make4.msxbuild
-MB_PROJ_META_ARTIFACT_ID ?= msxbuild
-MB_PROJ_META_VERSION ?= 1.0.0
-MB_PROJ_META_NAME ?= MSXBUILD
-MB_PROJ_META_DESCRIPTION ?= Library to use openMSX in build pipeline.
-MB_PROJ_META_WEBSITE ?= https://code.distributedrebirth.love/arch-msx/msxbuild
+MB_PROJ_META_GROUP_ID := love.distributedrebirth.msx4.firemake.make4.msxbuild
+MB_PROJ_META_ARTIFACT_ID := msxbuild
+MB_PROJ_META_VERSION := 1.0.0
+MB_PROJ_META_NAME := MSXBUILD
+MB_PROJ_META_DESCRIPTION := Library to use openMSX in build pipeline.
+MB_PROJ_META_WEBSITE := https://code.distributedrebirth.love/arch-msx/msxbuild
 .RECIPEPREFIX := _
 .DEFAULT_GOAL := @all
 -include Makelocal.mk