diff --git a/Makefile b/Makefile
index c78a996ce..73f5d1574 100644
--- a/Makefile
+++ b/Makefile
@@ -4,10 +4,10 @@ else
 SHA1 := sha1sum
 endif
 
-RGBASM := rgbasm
-RGBFIX := rgbfix
-RGBGFX := rgbgfx
-RGBLINK := rgblink
+RGBASM ?= rgbasm
+RGBFIX ?= rgbfix
+RGBGFX ?= rgbgfx
+RGBLINK ?= rgblink
 
 roms := pokecrystal.gbc pokecrystal11.gbc