diff --git a/src/battle_transition.c b/src/battle_transition.c
index 559279e74..4a9d26303 100644
--- a/src/battle_transition.c
+++ b/src/battle_transition.c
@@ -3973,11 +3973,8 @@ static bool8 Phase2_FrontierLogoWave_Func4(struct Task *task)
 
     for (i = 0; i < 160; i++, var6 += var8)
     {
-        s16 index = var6 / 256;
-        #ifndef NONMATCHING
-            asm("");
-        #endif
-        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_16 + Sin(index, amplitude);
+        const u16 index = var6 >> 8;
+        gScanlineEffectRegBuffers[0][i] = sTransitionStructPtr->field_16 + Sin(index & 0xff, amplitude);
     }
 
     if (++task->tData3 == 101)