diff --git a/src/tools/coordinate.py b/src/tools/coordinate.py
index a61988b..54a4a49 100644
--- a/src/tools/coordinate.py
+++ b/src/tools/coordinate.py
@@ -236,7 +236,7 @@ class Coordinate(tuple):
         diff = target - self
 
         if self[2] is None:
-            steps = gcd(diff[0], diff[0])
+            steps = gcd(diff[0], diff[1])
             step_x = diff[0] // steps
             step_y = diff[1] // steps
             return [