diff --git a/src/openrct2-ui/interface/Window.cpp b/src/openrct2-ui/interface/Window.cpp
index f80393b5bf..3ae2a9ed1f 100644
--- a/src/openrct2-ui/interface/Window.cpp
+++ b/src/openrct2-ui/interface/Window.cpp
@@ -224,8 +224,8 @@ WindowBase* WindowCreate(
     }
 
     // Check if there are any window slots left
-    // include WINDOW_LIMIT_RESERVED for items such as the main viewport and toolbars to not appear to be counted.
-    if (g_window_list.size() >= static_cast<size_t>(gConfigGeneral.WindowLimit + WINDOW_LIMIT_RESERVED))
+    // include kWindowLimitReserved for items such as the main viewport and toolbars to not appear to be counted.
+    if (g_window_list.size() >= static_cast<size_t>(gConfigGeneral.WindowLimit + kWindowLimitReserved))
     {
         // Close least recently used window
         for (auto& w : g_window_list)
diff --git a/src/openrct2/interface/Window.cpp b/src/openrct2/interface/Window.cpp
index 8718d33891..52cc76ef1b 100644
--- a/src/openrct2/interface/Window.cpp
+++ b/src/openrct2/interface/Window.cpp
@@ -164,7 +164,7 @@ static void WindowCloseSurplus(int32_t cap, WindowClass avoid_classification)
     // find the amount of windows that are currently open
     auto count = static_cast<int32_t>(g_window_list.size());
     // difference between amount open and cap = amount to close
-    auto diff = count - WINDOW_LIMIT_RESERVED - cap;
+    auto diff = count - kWindowLimitReserved - cap;
     for (auto i = 0; i < diff; i++)
     {
         // iterates through the list until it finds the newest window, or a window that can be closed
diff --git a/src/openrct2/interface/Window.h b/src/openrct2/interface/Window.h
index bf023a396e..1e58689a92 100644
--- a/src/openrct2/interface/Window.h
+++ b/src/openrct2/interface/Window.h
@@ -484,7 +484,7 @@ using close_callback = void (*)();
 
 constexpr int8_t kWindowLimitMin = 4;
 constexpr int8_t kWindowLimitMax = 64;
-#define WINDOW_LIMIT_RESERVED 4 // Used to reserve room for the main viewport, toolbars, etc.
+constexpr int8_t kWindowLimitReserved = 4; // Used to reserve room for the main viewport, toolbars, etc.
 
 extern WindowBase* gWindowAudioExclusive;