diff --git a/src/openseadragon.js b/src/openseadragon.js
index ef8507cf..c778389d 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -1242,7 +1242,7 @@ function OpenSeadragon( options ){
             },
             zoomPerClick:           2,
             zoomPerScroll:          1.2,
-            zoomPerDblTapDrag:      10000000000000000000000,
+            zoomPerDblTapDrag:      1.2,
             zoomPerSecond:          1.0,
             blendTime:              0,
             alwaysBlend:            false,
diff --git a/src/viewer.js b/src/viewer.js
index c68ea507..639bbb73 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2993,7 +2993,7 @@ function onCanvasDrag( event ) {
     gestureSettings = this.gestureSettingsByDeviceType( event.pointerType );
 
     if (gestureSettings.dblClickToZoom && THIS[ this.hash ].draggingToZoom){
-        var factor = Math.pow( this.zoomPerDblTapDrag, event.delta.y );
+        var factor = Math.pow( this.zoomPerDblTapDrag, event.delta.y / 100 );
         this.viewport.zoomBy(factor);
         this.viewport.applyConstraints();
     }