diff --git a/Makefile b/Makefile
index d430691..746d300 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
-GODOT=godot3-server
-EXPORT_TEMPLATE_SOURCE=https://downloads.tuxfamily.org/godotengine/3.0.2/Godot_v3.0.2-stable_export_templates.tpz
+GODOT?=godot3-server
+EXPORT_TEMPLATE_SOURCE?=https://downloads.tuxfamily.org/godotengine/3.0.2/Godot_v3.0.2-stable_export_templates.tpz
 BUILD_DIR?=build
 GODOT_PROJECT_PATH?=game
 PROJECT_NAME?=game