diff --git a/src/ol/color.js b/src/ol/color.js
index 69a39c4bef..338a23446b 100644
--- a/src/ol/color.js
+++ b/src/ol/color.js
@@ -1,6 +1,7 @@
 goog.provide('ol.color');
 
 goog.require('ol');
+goog.require('ol.asserts');
 goog.require('ol.math');
 
 
diff --git a/src/ol/extent.js b/src/ol/extent.js
index f7430cef6d..7b981dd668 100644
--- a/src/ol/extent.js
+++ b/src/ol/extent.js
@@ -2,6 +2,8 @@ goog.provide('ol.extent');
 goog.provide('ol.extent.Corner');
 goog.provide('ol.extent.Relationship');
 
+goog.require('ol.asserts');
+
 
 /**
  * Extent corner.
diff --git a/src/ol/feature.js b/src/ol/feature.js
index 0bb9b6b2c5..50ab18655c 100644
--- a/src/ol/feature.js
+++ b/src/ol/feature.js
@@ -1,5 +1,6 @@
 goog.provide('ol.Feature');
 
+goog.require('ol.asserts');
 goog.require('ol.events');
 goog.require('ol.events.EventType');
 goog.require('ol');
diff --git a/src/ol/format/esrijson.js b/src/ol/format/esrijson.js
index c0de4c2fe7..a77bf8098b 100644
--- a/src/ol/format/esrijson.js
+++ b/src/ol/format/esrijson.js
@@ -2,6 +2,7 @@ goog.provide('ol.format.EsriJSON');
 
 goog.require('ol.Feature');
 goog.require('ol.array');
+goog.require('ol.asserts');
 goog.require('ol.extent');
 goog.require('ol.format.Feature');
 goog.require('ol.format.JSONFeature');
diff --git a/src/ol/format/geojson.js b/src/ol/format/geojson.js
index b5f82272fc..325d418c1b 100644
--- a/src/ol/format/geojson.js
+++ b/src/ol/format/geojson.js
@@ -3,6 +3,7 @@
 
 goog.provide('ol.format.GeoJSON');
 
+goog.require('ol.asserts');
 goog.require('ol.Feature');
 goog.require('ol.format.Feature');
 goog.require('ol.format.JSONFeature');
diff --git a/src/ol/format/kml.js b/src/ol/format/kml.js
index 83c0c3b3b1..0950e94150 100644
--- a/src/ol/format/kml.js
+++ b/src/ol/format/kml.js
@@ -9,6 +9,7 @@ goog.require('goog.object');
 goog.require('ol');
 goog.require('ol.Feature');
 goog.require('ol.array');
+goog.require('ol.asserts');
 goog.require('ol.color');
 goog.require('ol.format.Feature');
 goog.require('ol.format.XMLFeature');
diff --git a/src/ol/format/polyline.js b/src/ol/format/polyline.js
index a7b3a8ad40..2ebe960942 100644
--- a/src/ol/format/polyline.js
+++ b/src/ol/format/polyline.js
@@ -1,5 +1,6 @@
 goog.provide('ol.format.Polyline');
 
+goog.require('ol.asserts');
 goog.require('ol.Feature');
 goog.require('ol.format.Feature');
 goog.require('ol.format.TextFeature');
diff --git a/src/ol/format/wfs.js b/src/ol/format/wfs.js
index 185e5c97e2..029343be2c 100644
--- a/src/ol/format/wfs.js
+++ b/src/ol/format/wfs.js
@@ -1,6 +1,7 @@
 goog.provide('ol.format.WFS');
 
 goog.require('ol');
+goog.require('ol.asserts');
 goog.require('ol.format.GML3');
 goog.require('ol.format.GMLBase');
 goog.require('ol.format.ogc.filter');
diff --git a/src/ol/interaction/select.js b/src/ol/interaction/select.js
index b79f016914..7badba2d1b 100644
--- a/src/ol/interaction/select.js
+++ b/src/ol/interaction/select.js
@@ -2,6 +2,7 @@ goog.provide('ol.interaction.Select');
 goog.provide('ol.interaction.SelectEvent');
 goog.provide('ol.interaction.SelectEventType');
 
+goog.require('ol.asserts');
 goog.require('ol.functions');
 goog.require('ol.Collection');
 goog.require('ol.Feature');
diff --git a/src/ol/layer/group.js b/src/ol/layer/group.js
index 4406463e71..394d898f8f 100644
--- a/src/ol/layer/group.js
+++ b/src/ol/layer/group.js
@@ -1,5 +1,6 @@
 goog.provide('ol.layer.Group');
 
+goog.require('ol.asserts');
 goog.require('ol.Collection');
 goog.require('ol.Object');
 goog.require('ol.ObjectEventType');
diff --git a/src/ol/layer/vectortile.js b/src/ol/layer/vectortile.js
index 6a3410cb0e..843916eaee 100644
--- a/src/ol/layer/vectortile.js
+++ b/src/ol/layer/vectortile.js
@@ -1,5 +1,6 @@
 goog.provide('ol.layer.VectorTile');
 
+goog.require('ol.asserts');
 goog.require('ol.layer.Vector');
 goog.require('ol.obj');
 
diff --git a/src/ol/map.js b/src/ol/map.js
index 61ae009284..acd498c91b 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -18,6 +18,7 @@ goog.require('ol.RendererType');
 goog.require('ol.TileQueue');
 goog.require('ol.View');
 goog.require('ol.array');
+goog.require('ol.asserts');
 goog.require('ol.control');
 goog.require('ol.dom');
 goog.require('ol.events');
diff --git a/src/ol/math.js b/src/ol/math.js
index d5308896b6..6db9774504 100644
--- a/src/ol/math.js
+++ b/src/ol/math.js
@@ -1,5 +1,7 @@
 goog.provide('ol.math');
 
+goog.require('ol.asserts');
+
 
 /**
  * Takes a number and clamps it to within the provided bounds.