diff --git a/Makefile b/Makefile
index 6203a623a..83a33b449 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ pokered.gbc: pokered.o
 	rgbfix -jsv -k 01 -m 0x13 -p 0 -r 03 -t "POKEMON RED" pokered.gbc
 	cmp baserom.gbc pokered.gbc
 
-pokered.o: pokered.asm
+pokered.o: pokered.asm constants.asm
 	rgbasm -o pokered.o pokered.asm
 
 clean: