diff --git a/API/main.py b/API/main.py
index 02dc1ad..a99426b 100755
--- a/API/main.py
+++ b/API/main.py
@@ -215,7 +215,7 @@ class Matrix(SampleBase):
 
 	# display circle at position with radius in current color
 	def circle(self, x: int, y: int, r: int):
-		graphics.DrawCircle(self.canvas, self.font, x, y, r, self.color)
+		graphics.DrawCircle(self.canvas, x, y, r, self.color)
 
 	# display rectangle at position with dimensions in current color
 	def rectangle(self, x: int, y: int, w: int, h: int):