diff --git a/inventory.asm b/inventory.asm
index b4c31ab..0efa872 100644
--- a/inventory.asm
+++ b/inventory.asm
@@ -708,8 +708,10 @@ RTS
 
 .setDungeonCompletion
 	LDX $040C : BMI +
+		REP #$20  ; 16 bit
 		LDA.l DungeonMask, X
 		ORA DungeonsCompleted : STA DungeonsCompleted
+		SEP #$20  ; 8 bit
 	+
 RTS
 ;--------------------------------------------------------------------------------