diff --git a/winarea_d2d/ui.h b/winarea_d2d/ui.h
index ca9113c9..03698508 100644
--- a/winarea_d2d/ui.h
+++ b/winarea_d2d/ui.h
@@ -115,8 +115,7 @@ struct uiDrawBrushGradientStop {
 struct uiDrawStrokeParams {
 	uiDrawLineCap Cap;
 	uiDrawLineJoin Join;
-	// TODO intmax_t?
-	intmax_t Thickness;
+	double Thickness;
 	double MiterLimit;
 };