diff --git a/src/drawing/NewDrawing.cpp b/src/drawing/NewDrawing.cpp
index f0cd7fdfda..bbfaec4c7c 100644
--- a/src/drawing/NewDrawing.cpp
+++ b/src/drawing/NewDrawing.cpp
@@ -176,7 +176,7 @@ extern "C"
     {
     }
 
-    void gfx_clear(rct_drawpixelinfo * dpi, int colour)
+    void gfx_clear(rct_drawpixelinfo * dpi, uint32 colour)
     {
         if (_drawingEngine != nullptr)
         {
diff --git a/src/drawing/drawing.h b/src/drawing/drawing.h
index 7de1579fbc..c2627a519b 100644
--- a/src/drawing/drawing.h
+++ b/src/drawing/drawing.h
@@ -160,7 +160,7 @@ void gfx_transpose_palette(int pal, unsigned char product);
 void load_palette();
 
 // other
-void gfx_clear(rct_drawpixelinfo *dpi, int colour);
+void gfx_clear(rct_drawpixelinfo *dpi, uint32 colour);
 void gfx_draw_pixel(rct_drawpixelinfo *dpi, int x, int y, int colour);
 void gfx_invalidate_pickedup_peep();
 void gfx_draw_pickedup_peep(rct_drawpixelinfo *dpi);