diff --git a/include/menu_helpers.h b/include/menu_helpers.h
index 1434efcf3..df71ce252 100644
--- a/include/menu_helpers.h
+++ b/include/menu_helpers.h
@@ -7,7 +7,7 @@
 #define MENU_L_PRESSED 1
 #define MENU_R_PRESSED 2
 
-// Exported type declarations
+#define SWAP_LINE_HAS_MARGIN (1 << 7)
 
 struct YesNoFuncTable
 {
@@ -15,9 +15,6 @@ struct YesNoFuncTable
     TaskFunc noFunc;
 };
 
-// Exported RAM declarations
-
-// Exported ROM declarations
 void ResetVramOamAndBgCntRegs(void);
 void ResetAllBgsCoordinates(void);
 void SetVBlankHBlankCallbacksToNull(void);
diff --git a/src/battle_pyramid_bag.c b/src/battle_pyramid_bag.c
index 83bf35090..9cc65e14d 100644
--- a/src/battle_pyramid_bag.c
+++ b/src/battle_pyramid_bag.c
@@ -1608,5 +1608,5 @@ static void SetSwapLineInvisibility(bool8 invisible)
 
 static void UpdateSwapLinePos(u8 y)
 {
-    UpdateSwapLineSpritesPos(&gPyramidBagMenu->spriteIds[PBAG_SPRITE_SWAP_LINE_START], NUM_SWAP_LINE_SPRITES | 0x80, 120, (y + 1) * 16);
+    UpdateSwapLineSpritesPos(&gPyramidBagMenu->spriteIds[PBAG_SPRITE_SWAP_LINE_START], NUM_SWAP_LINE_SPRITES | SWAP_LINE_HAS_MARGIN, 120, (y + 1) * 16);
 }
diff --git a/src/item_menu_icons.c b/src/item_menu_icons.c
index c8d1cd8d0..8bcf506fb 100644
--- a/src/item_menu_icons.c
+++ b/src/item_menu_icons.c
@@ -559,7 +559,7 @@ void SetItemMenuSwapLineInvisibility(bool8 invisible)
 
 void UpdateItemMenuSwapLinePos(u8 y)
 {
-    UpdateSwapLineSpritesPos(&gBagMenu->spriteIds[ITEMMENUSPRITE_SWAP_LINE], ITEMMENU_SWAP_LINE_LENGTH | 0x80, 120, (y + 1) * 16);
+    UpdateSwapLineSpritesPos(&gBagMenu->spriteIds[ITEMMENUSPRITE_SWAP_LINE], ITEMMENU_SWAP_LINE_LENGTH | SWAP_LINE_HAS_MARGIN, 120, (y + 1) * 16);
 }
 
 static void sub_80D5018(void *mem0, void *mem1)
diff --git a/src/menu_helpers.c b/src/menu_helpers.c
index 3e8148a42..95b67f78c 100644
--- a/src/menu_helpers.c
+++ b/src/menu_helpers.c
@@ -440,12 +440,16 @@ void SetSwapLineSpritesInvisibility(u8 *spriteIds, u8 count, bool8 invisible)
 void UpdateSwapLineSpritesPos(u8 *spriteIds, u8 count, s16 x, u16 y)
 {
     u8 i;
-    bool8 unknownBit = count & 0x80;
-    count &= ~(0x80);
+    bool8 hasMargin = count & SWAP_LINE_HAS_MARGIN;
+    count &= ~SWAP_LINE_HAS_MARGIN;
 
     for (i = 0; i < count; i++)
     {
-        if (i == count - 1 && unknownBit)
+        // If the list menu has a right margin, the swap line
+        // shouldn't extend all the way to the edge of the screen.
+        // If this is the last sprite in the line, move it a bit
+        // to the left to keep it out of the margin.
+        if (i == count - 1 && hasMargin)
             gSprites[spriteIds[i]].x2 = x - 8;
         else
             gSprites[spriteIds[i]].x2 = x;