diff --git a/widget/material/progressbar.go b/widget/material/progressbar.go
index c842171d..00d4c9f6 100644
--- a/widget/material/progressbar.go
+++ b/widget/material/progressbar.go
@@ -54,6 +54,9 @@ func (p ProgressBarStyle) Layout(gtx layout.Context) layout.Dimensions {
 			if !gtx.Enabled() {
 				fillColor = f32color.Disabled(fillColor)
 			}
+			if fillWidth < int(p.Radius*2) {
+				fillWidth = int(p.Radius * 2)
+			}
 			return shader(fillWidth, fillColor)
 		}),
 	)