diff --git a/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp b/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
index 51a5dd8f91..db0b7d18dc 100644
--- a/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
+++ b/src/openrct2-ui/drawing/engines/opengl/TextureCache.cpp
@@ -170,10 +170,13 @@ void TextureCache::CreateTextures()
 
 void TextureCache::GeneratePaletteTexture()
 {
-    rct_drawpixelinfo dpi = CreateDPI(256, PALETTE_TO_G1_OFFSET_COUNT + 5);
+    static_assert(PALETTE_TO_G1_OFFSET_COUNT + 5 < 256, "Height of palette too large!");
+    constexpr int32_t height = 256;
+    constexpr int32_t width = height;
+    rct_drawpixelinfo dpi = CreateDPI(width, height);
 
     // Init no-op palette
-    for (int i = 0; i < 256; ++i)
+    for (int i = 0; i < width; ++i)
     {
         dpi.bits[i] = i;
     }
@@ -191,8 +194,7 @@ void TextureCache::GeneratePaletteTexture()
     }
 
     glBindTexture(GL_TEXTURE_RECTANGLE, _paletteTexture);
-    glTexImage2D(
-        GL_TEXTURE_RECTANGLE, 0, GL_R8UI, 256, PALETTE_TO_G1_OFFSET_COUNT + 5, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, dpi.bits);
+    glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_R8UI, width, height, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, dpi.bits);
     DeleteDPI(dpi);
 }