diff --git a/src/openrct2/interface/Window.cpp b/src/openrct2/interface/Window.cpp
index e5892c29d2..e0c59c7f6d 100644
--- a/src/openrct2/interface/Window.cpp
+++ b/src/openrct2/interface/Window.cpp
@@ -916,29 +916,6 @@ static constexpr float kWindowScrollLocations[][2] = {
         });
     }
 
-    Viewport* WindowGetPreviousViewport(Viewport* current)
-    {
-        bool foundPrevious = (current == nullptr);
-        for (auto it = g_window_list.rbegin(); it != g_window_list.rend(); it++)
-        {
-            auto& w = **it;
-            if (w.flags & WF_DEAD)
-                continue;
-            if (w.viewport != nullptr)
-            {
-                if (foundPrevious)
-                {
-                    return w.viewport;
-                }
-                if (w.viewport == current)
-                {
-                    foundPrevious = true;
-                }
-            }
-        }
-        return nullptr;
-    }
-
     void WindowInitAll()
     {
         auto* windowMgr = Ui::GetWindowManager();
diff --git a/src/openrct2/interface/Window.h b/src/openrct2/interface/Window.h
index 57ecd6b433..233a18bab0 100644
--- a/src/openrct2/interface/Window.h
+++ b/src/openrct2/interface/Window.h
@@ -333,7 +333,6 @@ namespace OpenRCT2
 
     void TextinputCancel();
 
-    Viewport* WindowGetPreviousViewport(Viewport* current);
     void WindowInitAll();
 
     void WindowFollowSprite(WindowBase& w, EntityId spriteIndex);