diff --git a/src/objectliterals.exports b/src/objectliterals.exports
index dd1ae0d5f8..6d62578b1d 100644
--- a/src/objectliterals.exports
+++ b/src/objectliterals.exports
@@ -81,6 +81,9 @@
 @exportObjectLiteralProperty ol.interaction.DefaultOptions.touchRotate boolean|undefined
 @exportObjectLiteralProperty ol.interaction.DefaultOptions.touchZoom boolean|undefined
 
+@exportObjectLiteral ol.interaction.KeyboardZoomOptions
+@exportObjectLiteralProperty ol.interaction.KeyboardZoomOptions.delta number|undefined
+
 @exportObjectLiteral ol.layer.LayerOptions
 @exportObjectLiteralProperty ol.layer.LayerOptions.brightness number|undefined
 @exportObjectLiteralProperty ol.layer.LayerOptions.contrast number|undefined
diff --git a/src/ol/interaction/keyboardzoominteraction.js b/src/ol/interaction/keyboardzoominteraction.js
index cbfe06c51e..5cdaa334e1 100644
--- a/src/ol/interaction/keyboardzoominteraction.js
+++ b/src/ol/interaction/keyboardzoominteraction.js
@@ -16,10 +16,21 @@ ol.interaction.KEYBOARD_ZOOM_DURATION = 100;
 
 /**
  * @constructor
+ * @param {ol.interaction.KeyboardZoomOptions=} opt_options Options.
  * @extends {ol.interaction.Interaction}
  */
-ol.interaction.KeyboardZoom = function() {
+ol.interaction.KeyboardZoom = function(opt_options) {
+
   goog.base(this);
+
+  var options = goog.isDef(opt_options) ? opt_options : {};
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.delta_ = goog.isDef(options.delta) ? options.delta : 1;
+
 };
 goog.inherits(ol.interaction.KeyboardZoom, ol.interaction.Interaction);
 
@@ -35,7 +46,7 @@ ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
     var charCode = keyEvent.charCode;
     if (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0)) {
       var map = mapBrowserEvent.map;
-      var delta = (charCode == '+'.charCodeAt(0)) ? 4 : -4;
+      var delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;
       map.requestRenderFrame();
       // FIXME works for View2D only
       var view = map.getView();