diff --git a/src/potion.c b/src/potion.c
index 27bd237d6..23bc51e90 100644
--- a/src/potion.c
+++ b/src/potion.c
@@ -1560,8 +1560,8 @@ H2Opotion_dip(
         res = TRUE;
     }
     return res;
-#undef COST_alter)
-#undef COST_none)
+#undef COST_alter
+#undef COST_none
 }
 
 /* used when blessed or cursed scroll of light interacts with artifact light;