diff --git a/src/window.vala b/src/window.vala
index 979eeaa..ec576a5 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -35,7 +35,7 @@ public class TheCatTools.Window : Adw.ApplicationWindow {
             accel.open_sync();
             accel.measurement.connect((x, y, z) => {
                 var x_angle = rad2deg(Math.atan2(x, z));
-                var y_angle = rad2deg(Math.atan2(x, z));
+                var y_angle = rad2deg(Math.atan2(y, z));
 
                 message("%f\t%f\t%f", x, y, z);
                 message("%f\t%f", x_angle, y_angle);