diff --git a/src/ol/interaction/dblclickzoom.js b/src/ol/interaction/dblclickzoom.js
index 128d6c56da..097ec28888 100644
--- a/src/ol/interaction/dblclickzoom.js
+++ b/src/ol/interaction/dblclickzoom.js
@@ -26,11 +26,8 @@ ol.interaction.DblClickZoom.prototype.handleMapBrowserEvent =
       mapBrowserEvent.isMouseActionButton()) {
     var map = mapBrowserEvent.map;
     var anchor = mapBrowserEvent.getCoordinate();
-    if (mapBrowserEvent.browserEvent.shiftKey) {
-      map.zoomOut(anchor);
-    } else {
-      map.zoomIn(anchor);
-    }
+    var delta = mapBrowserEvent.browserEvent.shiftKey ? -4 : 4;
+    map.zoom(delta, anchor);
     mapBrowserEvent.preventDefault();
   }
 };
diff --git a/src/ol/interaction/keyboardzoom.js b/src/ol/interaction/keyboardzoom.js
index dcce3c0e23..d02249755b 100644
--- a/src/ol/interaction/keyboardzoom.js
+++ b/src/ol/interaction/keyboardzoom.js
@@ -27,11 +27,8 @@ ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
     var charCode = keyEvent.charCode;
     if (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0)) {
       var map = mapBrowserEvent.map;
-      if (charCode == '+'.charCodeAt(0)) {
-        map.zoomIn();
-      } else {
-        map.zoomOut();
-      }
+      var delta = (charCode == '+'.charCodeAt(0)) ? 4 : -4;
+      map.zoom(delta);
       keyEvent.preventDefault();
       mapBrowserEvent.preventDefault();
     }
diff --git a/src/ol/map.js b/src/ol/map.js
index d5c3671f47..62c68daaca 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -838,28 +838,12 @@ ol.Map.prototype.zoom_ = function(resolution, opt_anchor) {
  * @param {number} delta Delta from previous zoom level.
  * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
  */
-ol.Map.prototype.zoomByDelta = function(delta, opt_anchor) {
+ol.Map.prototype.zoom = function(delta, opt_anchor) {
   var resolution = this.constraints_.resolution(this.getResolution(), delta);
   this.zoom_(resolution, opt_anchor);
 };
 
 
-/**
- * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
- */
-ol.Map.prototype.zoomIn = function(opt_anchor) {
-  this.zoomByDelta(4, opt_anchor);
-};
-
-
-/**
- * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
- */
-ol.Map.prototype.zoomOut = function(opt_anchor) {
-  this.zoomByDelta(-4, opt_anchor);
-};
-
-
 /**
  * @param {number|undefined} resolution Resolution to go to.
  * @param {ol.Coordinate=} opt_anchor Anchor coordinate.