diff --git a/adafruit_display_shapes/polygon.py b/adafruit_display_shapes/polygon.py
index cbf79c1..a6adac7 100755
--- a/adafruit_display_shapes/polygon.py
+++ b/adafruit_display_shapes/polygon.py
@@ -127,7 +127,7 @@ def _line(self, x0, y0, x1, y1, color):
             else:
                 ystep = -1
 
-            for x in range(x0, x1):
+            for x in range(x0, x1 + 1):
                 if steep:
                     self._bitmap[y0, x] = color
                 else: