diff --git a/src/textual_canvas/canvas.py b/src/textual_canvas/canvas.py
index 4dbe8d7..30ac00b 100644
--- a/src/textual_canvas/canvas.py
+++ b/src/textual_canvas/canvas.py
@@ -167,7 +167,7 @@ def _pixel_check(self, x: int, y: int) -> None:
         """
         if self._outwith_the_canvas(x, y):
             raise CanvasError(
-                f"x={x}, x={y} is not within 0, 0, {self._width}, {self._height}"
+                f"x={x}, y={y} is not within 0, 0, {self._width}, {self._height}"
             )
 
     def clear(