diff --git a/src/ol/events.js b/src/ol/events.js
index 814a69dbc5..a427d9d58f 100644
--- a/src/ol/events.js
+++ b/src/ol/events.js
@@ -3,7 +3,6 @@ goog.provide('ol.events.EventType');
 goog.provide('ol.events.KeyCode');
 
 goog.require('ol.object');
-goog.require('ol.EventTargetLike');
 
 
 /**
diff --git a/src/ol/events/eventtarget.js b/src/ol/events/eventtarget.js
index fda4ade727..0c547506ad 100644
--- a/src/ol/events/eventtarget.js
+++ b/src/ol/events/eventtarget.js
@@ -5,6 +5,7 @@ goog.require('ol.Disposable');
 goog.require('ol.events');
 goog.require('ol.events.Event');
 
+
 /**
  * @classdesc
  * A simplified implementation of the W3C DOM Level 2 EventTarget interface.
diff --git a/src/ol/format/ogc/filter.js b/src/ol/format/ogc/filter.js
index ba486a91d9..e341b47027 100644
--- a/src/ol/format/ogc/filter.js
+++ b/src/ol/format/ogc/filter.js
@@ -18,8 +18,6 @@ goog.provide('ol.format.ogc.filter.IsNull');
 goog.provide('ol.format.ogc.filter.IsBetween');
 goog.provide('ol.format.ogc.filter.IsLike');
 
-goog.require('ol.Extent');
-
 
 /**
  * Create a logical `<And>` operator between two filter conditions.
@@ -365,7 +363,7 @@ ol.format.ogc.filter.Bbox = function(geometryName, extent, opt_srsName) {
 
   /**
    * @public
-   * @type {!ol.Extent}
+   * @type {ol.Extent}
    */
   this.extent = extent;
 
diff --git a/src/ol/structs/lrucache.js b/src/ol/structs/lrucache.js
index 4f1ee6cde1..f44c55af5c 100644
--- a/src/ol/structs/lrucache.js
+++ b/src/ol/structs/lrucache.js
@@ -133,7 +133,7 @@ ol.structs.LRUCache.prototype.get = function(key) {
   if (entry === this.newest_) {
     return entry.value_;
   } else if (entry === this.oldest_) {
-    this.oldest_ = this.oldest_.newer;
+    this.oldest_ = /** @type {ol.LRUCacheEntry} */ (this.oldest_.newer);
     this.oldest_.older = null;
   } else {
     entry.newer.older = entry.older;
@@ -216,7 +216,7 @@ ol.structs.LRUCache.prototype.pop = function() {
   if (entry.newer) {
     entry.newer.older = null;
   }
-  this.oldest_ = entry.newer;
+  this.oldest_ = /** @type {ol.LRUCacheEntry} */ (entry.newer);
   if (!this.oldest_) {
     this.newest_ = null;
   }
@@ -244,12 +244,12 @@ ol.structs.LRUCache.prototype.set = function(key, value) {
       'key is not a standard property of objects (e.g. "__proto__")');
   goog.asserts.assert(!(key in this.entries_),
       'key is not used already');
-  var entry = {
+  var entry = /** @type {ol.LRUCacheEntry} */ ({
     key_: key,
     newer: null,
     older: this.newest_,
     value_: value
-  };
+  });
   if (!this.newest_) {
     this.oldest_ = entry;
   } else {
diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index 67341c7c0e..ffe8677a77 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -11,13 +11,7 @@
  * appear in module code.
  *
  * They are now all in the `ol` namespace.
- *
- * In principle, typedefs should not have a `goog.provide` nor should files which
- * refer to a typedef in comments need a `goog.require`. However, goog.provides
- * are needed for 2 cases, both to prevent compiler errors/warnings.
  */
-goog.provide('ol.Extent');
-goog.provide('ol.EventTargetLike');
 
 
 /**
@@ -126,7 +120,7 @@ ol.ColorLike;
 
 /**
  * An array of numbers representing an xy coordinate. Example: `[16, 48]`.
- * @typedef {Array.<number>} ol.Coordinate
+ * @typedef {Array.<number>}
  */
 ol.Coordinate;
 
@@ -161,15 +155,6 @@ ol.DragBoxEndConditionType;
 ol.DrawGeometryFunctionType;
 
 
-/**
- * @typedef {EventTarget|ol.events.EventTarget|
- *     {addEventListener: function(string, Function, boolean=),
- *     removeEventListener: function(string, Function, boolean=),
- *     dispatchEvent: function(string)}}
- */
-ol.EventTargetLike;
-
-
 /**
  * A function that takes an {@link ol.MapBrowserEvent} and returns a
  * `{boolean}`. If the condition is met, true should be returned.
@@ -202,6 +187,12 @@ ol.EventsKey;
 ol.EventsListenerFunctionType;
 
 
+/**
+ * @typedef {EventTarget|ol.events.EventTarget}
+ */
+ol.EventTargetLike;
+
+
 /**
  * An array of numbers representing an extent: `[minx, miny, maxx, maxy]`.
  * @typedef {Array.<number>}
@@ -318,8 +309,8 @@ ol.LoadingStrategy;
 
 /**
  * @typedef {{key_: string,
- *            newer: ol.LRUCacheEntry,
- *            older: ol.LRUCacheEntry,
+ *            newer: Object,
+ *            older: Object,
  *            value_: *}}
  */
 ol.LRUCacheEntry;
diff --git a/tasks/build.js b/tasks/build.js
index 445d780589..0fe827e0fb 100644
--- a/tasks/build.js
+++ b/tasks/build.js
@@ -206,6 +206,7 @@ function build(config, paths, callback) {
     concatenate(paths, callback);
   } else {
     log.info('ol', 'Compiling ' + paths.length + ' sources');
+    paths = paths.concat('src/ol/typedefs.js');
     options.compile.js = paths.concat(options.compile.js || []);
     closure.compile(options, callback);
   }