diff --git a/src/input.js b/src/input.js
index e9601ca68..e22c647de 100644
--- a/src/input.js
+++ b/src/input.js
@@ -379,7 +379,7 @@ function getAngle(p1, p2, props) {
  * @return {Number} rotation
  */
 function getRotation(start, end) {
-    return getAngle(end[1], end[0], PROPS_CLIENT_XY) + getAngle(start[1], start[0], PROPS_CLIENT_XY);
+    return getAngle(end[1], end[0], PROPS_CLIENT_XY) - getAngle(start[1], start[0], PROPS_CLIENT_XY);
 }
 
 /**