diff --git a/src/openrct2-ui/windows/Park.cpp b/src/openrct2-ui/windows/Park.cpp
index 233d86cbdf..eef2830394 100644
--- a/src/openrct2-ui/windows/Park.cpp
+++ b/src/openrct2-ui/windows/Park.cpp
@@ -451,7 +451,7 @@ namespace OpenRCT2::Ui::Windows
                 WindowDropdownShowText(
                     { windowPos.x + widget.left, windowPos.y + widget.top }, widget.height() + 1, colours[1], 0, 2);
 
-                if (getGameState().park.IsOpen())
+                if (Park::IsOpen(getGameState().park))
                 {
                     gDropdownDefaultIndex = 0;
                     Dropdown::SetChecked(1, true);
@@ -512,7 +512,7 @@ namespace OpenRCT2::Ui::Windows
                 ft.Add<StringId>(STR_STRING);
                 ft.Add<const char*>(parkName);
             }
-            const bool parkIsOpen = gameState.park.IsOpen();
+            const bool parkIsOpen = Park::IsOpen(gameState.park);
             widgets[WIDX_OPEN_OR_CLOSE].image = ImageId(parkIsOpen ? SPR_OPEN : SPR_CLOSED);
             const auto closeLightImage = SPR_G2_RCT1_CLOSE_BUTTON_0 + !parkIsOpen * 2
                 + widgetIsPressed(*this, WIDX_CLOSE_LIGHT);
@@ -598,7 +598,7 @@ namespace OpenRCT2::Ui::Windows
 
             // Draw park closed / open label
             auto ft = Formatter();
-            ft.Add<StringId>(getGameState().park.IsOpen() ? STR_PARK_OPEN : STR_PARK_CLOSED);
+            ft.Add<StringId>(Park::IsOpen(getGameState().park) ? STR_PARK_OPEN : STR_PARK_CLOSED);
 
             auto* labelWidget = &widgets[WIDX_STATUS];
             DrawTextEllipsised(
diff --git a/src/openrct2/actions/CheatSetAction.cpp b/src/openrct2/actions/CheatSetAction.cpp
index fef2f047f3..15175bbb20 100644
--- a/src/openrct2/actions/CheatSetAction.cpp
+++ b/src/openrct2/actions/CheatSetAction.cpp
@@ -231,7 +231,7 @@ GameActions::Result CheatSetAction::Execute() const
             gameState.cheats.neverendingMarketing = _param1 != 0;
             break;
         case CheatType::OpenClosePark:
-            ParkSetOpen(!gameState.park.IsOpen());
+            ParkSetOpen(!Park::IsOpen(gameState.park));
             break;
         case CheatType::HaveFun:
             gameState.scenarioObjective.Type = OBJECTIVE_HAVE_FUN;
diff --git a/src/openrct2/world/Park.cpp b/src/openrct2/world/Park.cpp
index 25367a7456..42d004b9f1 100644
--- a/src/openrct2/world/Park.cpp
+++ b/src/openrct2/world/Park.cpp
@@ -793,8 +793,8 @@ namespace OpenRCT2::Park
         return false;
     }
 
-    bool ParkData::IsOpen() const
+    bool IsOpen(const ParkData& park)
     {
-        return (Flags & PARK_FLAGS_PARK_OPEN) != 0;
+        return (park.Flags & PARK_FLAGS_PARK_OPEN) != 0;
     }
 } // namespace OpenRCT2::Park
diff --git a/src/openrct2/world/Park.h b/src/openrct2/world/Park.h
index 003041fd08..36e0c5a19c 100644
--- a/src/openrct2/world/Park.h
+++ b/src/openrct2/world/Park.h
@@ -22,6 +22,8 @@ namespace OpenRCT2
 
 namespace OpenRCT2::Park
 {
+    struct ParkData;
+
     void Initialise(GameState_t& gameState);
     void Update(GameState_t& gameState, const Date& date);
 
@@ -44,6 +46,7 @@ namespace OpenRCT2::Park
 
     uint8_t CalculateGuestInitialHappiness(uint8_t percentage);
 
+    bool IsOpen(const ParkData& park);
     void SetOpen(bool open);
     money64 GetEntranceFee();
 
diff --git a/src/openrct2/world/ParkData.h b/src/openrct2/world/ParkData.h
index 25789f279e..88ebd3e30d 100644
--- a/src/openrct2/world/ParkData.h
+++ b/src/openrct2/world/ParkData.h
@@ -65,7 +65,5 @@ namespace OpenRCT2::Park
         uint32_t Size;
         money64 Value;
         money64 ValueHistory[kFinanceHistorySize];
-
-        bool IsOpen() const;
     };
 } // namespace OpenRCT2::Park