diff --git a/src/ol/interaction/dragrotateandzoominteraction.js b/src/ol/interaction/dragrotateandzoominteraction.js
index 95df6f5320..9cc3ab89ca 100644
--- a/src/ol/interaction/dragrotateandzoominteraction.js
+++ b/src/ol/interaction/dragrotateandzoominteraction.js
@@ -79,7 +79,7 @@ ol.interaction.DragRotateAndZoom.prototype.handleDragStart =
         browserEvent.offsetX - size.width / 2,
         size.height / 2 - browserEvent.offsetY);
     var theta = Math.atan2(delta.y, delta.x);
-    this.startRotation_ = (view.getRotation() || 0) + theta;
+    this.startRotation_ = view.getRotation() + theta;
     this.startRatio_ = resolution / delta.magnitude();
     map.requestRenderFrame();
     return true;
diff --git a/src/ol/interaction/dragrotateinteraction.js b/src/ol/interaction/dragrotateinteraction.js
index f951f6fd2c..048a847957 100644
--- a/src/ol/interaction/dragrotateinteraction.js
+++ b/src/ol/interaction/dragrotateinteraction.js
@@ -67,7 +67,7 @@ ol.interaction.DragRotate.prototype.handleDragStart =
     var theta = Math.atan2(
         size.height / 2 - offset.y,
         offset.x - size.width / 2);
-    this.startRotation_ = (view.getRotation() || 0) + theta;
+    this.startRotation_ = view.getRotation() + theta;
     return true;
   } else {
     return false;