diff --git a/LTTP_RND_GeneralBugfixes.asm b/LTTP_RND_GeneralBugfixes.asm
index a9c3585..20030f6 100644
--- a/LTTP_RND_GeneralBugfixes.asm
+++ b/LTTP_RND_GeneralBugfixes.asm
@@ -28,8 +28,8 @@ org $1FFFF8 ; <- FFFF8 timestamp rom
 db #$20, #$19, #$08, #$31 ; year/month/day
 
 ;================================================================================
-!ROM_VERSION_LOW = 1  ; ROM version (two 16-bit integers)
-!ROM_VERSION_HIGH = 1 ;
+!ROM_VERSION_LOW ?= 1  ; ROM version (two 16-bit integers)
+!ROM_VERSION_HIGH ?= 1 ;
 
 org $00FFE0 ; Unused hardware vector
 RomVersion: