diff --git a/src/openrct2/ride/ShopItem.cpp b/src/openrct2/ride/ShopItem.cpp
index b54f67f12c..a438ad22e3 100644
--- a/src/openrct2/ride/ShopItem.cpp
+++ b/src/openrct2/ride/ShopItem.cpp
@@ -110,7 +110,7 @@ bool shop_item_has_common_price(int32_t shopItem)
     return (gSamePriceThroughoutPark & (1ULL << shopItem)) != 0;
 }
 
-bool ShopItemDescriptor::HasFlag(uint16_t flag) const
+bool ShopItemDescriptor::HasFlag(const uint16_t flag) const
 {
     return (Flags & flag) != 0;
 }
diff --git a/src/openrct2/ride/ShopItem.h b/src/openrct2/ride/ShopItem.h
index e2758ac7fc..c9b352d291 100644
--- a/src/openrct2/ride/ShopItem.h
+++ b/src/openrct2/ride/ShopItem.h
@@ -90,7 +90,7 @@ struct ShopItemDescriptor
     ShopItemStrings Naming;
     uint16_t Flags;
 
-    bool HasFlag(uint16_t flag) const;
+    bool HasFlag(const uint16_t flag) const;
     bool IsFood() const;
     bool IsDrink() const;
     bool IsFoodOrDrink() const;