diff --git a/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp b/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
index 8272b1a4ba..3c9eb8d86c 100644
--- a/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
+++ b/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
@@ -30,7 +30,7 @@ TextureCache::~TextureCache()
 
 void TextureCache::InvalidateImage(uint32_t image)
 {
-    std::unique_lock<std::shared_mutex> lock(_mutex);
+    unique_lock lock(_mutex);
 
     uint32_t index = _indexMap[image];
     if (index == UNUSED_INDEX)
@@ -83,7 +83,7 @@ BasicTextureInfo TextureCache::GetOrLoadImageTexture(uint32_t image)
     }
 
     // Load new texture.
-    std::unique_lock<std::shared_mutex> lock(_mutex);
+    unique_lock lock(_mutex);
 
     index = (uint32_t)_textureCache.size();
 
@@ -118,7 +118,7 @@ BasicTextureInfo TextureCache::GetOrLoadGlyphTexture(uint32_t image, uint8_t* pa
     }
 
     // Load new texture.
-    std::unique_lock<std::shared_mutex> lock(_mutex);
+    unique_lock lock(_mutex);
 
     auto cacheInfo = LoadGlyphTexture(image, palette);
     auto it = _glyphTextureMap.insert(std::make_pair(glyphId, cacheInfo));
diff --git a/src/openrct2-ui/drawing/engines/opengl/TextureCache.h b/src/openrct2-ui/drawing/engines/opengl/TextureCache.h
index c9cebd2e73..c8fc9d584c 100644
--- a/src/openrct2-ui/drawing/engines/opengl/TextureCache.h
+++ b/src/openrct2-ui/drawing/engines/opengl/TextureCache.h
@@ -206,9 +206,11 @@ private:
 #ifndef __MACOSX__
     std::shared_mutex _mutex;
     typedef std::shared_lock<std::shared_mutex> shared_lock;
+    typedef std::unique_lock<std::shared_mutex> unique_lock;
 #else
     std::mutex _mutex;
     typedef std::unique_lock<std::mutex> shared_lock;
+    typedef std::unique_lock<std::mutex> unique_lock;
 #endif
 
 public: