diff --git a/src/backend.rs b/src/backend.rs
index 8b1eb73..41ea366 100644
--- a/src/backend.rs
+++ b/src/backend.rs
@@ -161,7 +161,7 @@ impl<'a, 'b> DrawingBackend for PistonBackend<'a, 'b> {
         style: &S,
         fill: bool,
     ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
-        let rect = circle(center.0 as f64, center.1 as f64, radius as f64);
+        let rect = circle(center.0 as f64 * self.scale, center.1 as f64 * self.scale, radius as f64 * self.scale);
         if fill {
             ellipse(
                 make_piston_rgba(&style.color()),