diff --git a/src/ol/source/imagearcgisrestsource.js b/src/ol/source/imagearcgisrestsource.js
index df4eb747e8..8e5aa11561 100644
--- a/src/ol/source/imagearcgisrestsource.js
+++ b/src/ol/source/imagearcgisrestsource.js
@@ -1,7 +1,6 @@
 goog.provide('ol.source.ImageArcGISRest');
 
 goog.require('goog.asserts');
-goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.Image');
 goog.require('ol.events');
@@ -10,6 +9,7 @@ goog.require('ol.extent');
 goog.require('ol.object');
 goog.require('ol.proj');
 goog.require('ol.source.Image');
+goog.require('ol.uri');
 
 
 /**
@@ -215,7 +215,7 @@ ol.source.ImageArcGISRest.prototype.getRequestUrl_ = function(extent, size, pixe
   if (modifiedUrl == url) {
     goog.asserts.fail('Unknown Rest Service', url);
   }
-  return goog.uri.utils.appendParamsFromMap(modifiedUrl, params);
+  return ol.uri.appendParams(modifiedUrl, params);
 };
 
 
diff --git a/src/ol/source/imagemapguidesource.js b/src/ol/source/imagemapguidesource.js
index bf64da371c..1487b77554 100644
--- a/src/ol/source/imagemapguidesource.js
+++ b/src/ol/source/imagemapguidesource.js
@@ -2,11 +2,11 @@ goog.provide('ol.source.ImageMapGuide');
 
 goog.require('ol.events');
 goog.require('ol.events.EventType');
-goog.require('goog.uri.utils');
 goog.require('ol.Image');
 goog.require('ol.extent');
 goog.require('ol.object');
 goog.require('ol.source.Image');
+goog.require('ol.uri');
 
 
 /**
@@ -222,7 +222,7 @@ ol.source.ImageMapGuide.prototype.getUrl = function(baseUrl, params, extent, siz
     'SETVIEWCENTERY': center[1]
   };
   ol.object.assign(baseParams, params);
-  return goog.uri.utils.appendParamsFromMap(baseUrl, baseParams);
+  return ol.uri.appendParams(baseUrl, baseParams);
 };
 
 
diff --git a/src/ol/source/imagewmssource.js b/src/ol/source/imagewmssource.js
index 533d70ed30..3fe29b345b 100644
--- a/src/ol/source/imagewmssource.js
+++ b/src/ol/source/imagewmssource.js
@@ -3,7 +3,6 @@
 goog.provide('ol.source.ImageWMS');
 
 goog.require('goog.asserts');
-goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.Image');
 goog.require('ol.events');
@@ -15,6 +14,7 @@ goog.require('ol.source.Image');
 goog.require('ol.source.wms');
 goog.require('ol.source.wms.ServerType');
 goog.require('ol.string');
+goog.require('ol.uri');
 
 
 /**
@@ -312,7 +312,7 @@ ol.source.ImageWMS.prototype.getRequestUrl_ = function(extent, size, pixelRatio,
   }
   params['BBOX'] = bbox.join(',');
 
-  return goog.uri.utils.appendParamsFromMap(this.url_, params);
+  return ol.uri.appendParams(this.url_, params);
 };
 
 
diff --git a/src/ol/source/tilearcgisrestsource.js b/src/ol/source/tilearcgisrestsource.js
index a3da3253f6..6782273e86 100644
--- a/src/ol/source/tilearcgisrestsource.js
+++ b/src/ol/source/tilearcgisrestsource.js
@@ -1,7 +1,6 @@
 goog.provide('ol.source.TileArcGISRest');
 
 goog.require('goog.asserts');
-goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.extent');
 goog.require('ol.object');
@@ -10,6 +9,7 @@ goog.require('ol.proj');
 goog.require('ol.size');
 goog.require('ol.source.TileImage');
 goog.require('ol.tilecoord');
+goog.require('ol.uri');
 
 
 /**
@@ -114,7 +114,7 @@ ol.source.TileArcGISRest.prototype.getRequestUrl_ = function(tileCoord, tileSize
   if (modifiedUrl == url) {
     goog.asserts.fail('Unknown Rest Service', url);
   }
-  return goog.uri.utils.appendParamsFromMap(modifiedUrl, params);
+  return ol.uri.appendParams(modifiedUrl, params);
 };
 
 
diff --git a/src/ol/source/tilewmssource.js b/src/ol/source/tilewmssource.js
index b9a9d78215..19caa65b20 100644
--- a/src/ol/source/tilewmssource.js
+++ b/src/ol/source/tilewmssource.js
@@ -5,7 +5,6 @@
 goog.provide('ol.source.TileWMS');
 
 goog.require('goog.asserts');
-goog.require('goog.uri.utils');
 goog.require('ol');
 goog.require('ol.extent');
 goog.require('ol.object');
@@ -17,7 +16,7 @@ goog.require('ol.source.wms');
 goog.require('ol.source.wms.ServerType');
 goog.require('ol.tilecoord');
 goog.require('ol.string');
-
+goog.require('ol.uri');
 
 /**
  * @classdesc
@@ -265,7 +264,7 @@ ol.source.TileWMS.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileE
     var index = ol.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
     url = urls[index];
   }
-  return goog.uri.utils.appendParamsFromMap(url, params);
+  return ol.uri.appendParams(url, params);
 };
 
 
diff --git a/src/ol/source/wmtssource.js b/src/ol/source/wmtssource.js
index ebb71b6360..700e8ace97 100644
--- a/src/ol/source/wmtssource.js
+++ b/src/ol/source/wmtssource.js
@@ -2,7 +2,6 @@ goog.provide('ol.source.WMTS');
 goog.provide('ol.source.WMTSRequestEncoding');
 
 goog.require('goog.asserts');
-goog.require('goog.uri.utils');
 goog.require('ol.TileUrlFunction');
 goog.require('ol.array');
 goog.require('ol.extent');
@@ -10,6 +9,7 @@ goog.require('ol.object');
 goog.require('ol.proj');
 goog.require('ol.source.TileImage');
 goog.require('ol.tilegrid.WMTS');
+goog.require('ol.uri');
 
 
 /**
@@ -123,7 +123,7 @@ ol.source.WMTS = function(options) {
     // special template params
 
     template = (requestEncoding == ol.source.WMTSRequestEncoding.KVP) ?
-        goog.uri.utils.appendParamsFromMap(template, context) :
+        ol.uri.appendParams(template, context) :
         template.replace(/\{(\w+?)\}/g, function(m, p) {
           return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;
         });
@@ -147,7 +147,7 @@ ol.source.WMTS = function(options) {
             ol.object.assign(localContext, dimensions);
             var url = template;
             if (requestEncoding == ol.source.WMTSRequestEncoding.KVP) {
-              url = goog.uri.utils.appendParamsFromMap(url, localContext);
+              url = ol.uri.appendParams(url, localContext);
             } else {
               url = url.replace(/\{(\w+?)\}/g, function(m, p) {
                 return localContext[p];
diff --git a/src/ol/uri.js b/src/ol/uri.js
new file mode 100644
index 0000000000..b73c5f642d
--- /dev/null
+++ b/src/ol/uri.js
@@ -0,0 +1,21 @@
+goog.provide('ol.uri');
+
+
+/**
+ * Appends query parameters to a URI.
+ *
+ * @param {string} uri The original URI, which may already have query data.
+ * @param {!Object} params An object where keys are URI-encoded parameter keys,
+ *     and the values are arbitrary types or arrays.
+ * @return {string} The new URI.
+ */
+ol.uri.appendParams = function(uri, params) {
+  var qs = Object.keys(params).map(function(k) {
+    return k + '=' + encodeURIComponent(params[k]);
+  }).join('&');
+  // remove any trailing ? or &
+  uri = uri.replace(/[?&]$/, '')
+  // append ? or & depending on whether uri has existing parameters
+  uri = uri.indexOf('?') === -1 ? uri + '?' : uri + '&'
+  return uri + qs;
+};
diff --git a/test/spec/ol/uri.test.js b/test/spec/ol/uri.test.js
new file mode 100644
index 0000000000..2d0fd40b7b
--- /dev/null
+++ b/test/spec/ol/uri.test.js
@@ -0,0 +1,64 @@
+goog.provide('ol.test.uri');
+
+describe('ol.uri.appendParams()', function() {
+
+  it('should append empty STYLES with =', function() {
+    var url = ol.uri.appendParams('http://example.com/foo', {
+      SERVICE: 'WMS',
+      STYLES: ''
+    });
+    expect(url).to.equal('http://example.com/foo?SERVICE=WMS&STYLES=');
+  });
+
+  it('should URL encode values but not names', function() {
+    var url = ol.uri.appendParams('http://example.com/foo', {
+      'k ': 'v '
+    });
+    expect(url).to.equal('http://example.com/foo?k =v%20');
+  });
+
+  it('should append to simple base URL', function() {
+    var url = ol.uri.appendParams('http://example.com/foo', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?k=v');
+  });
+
+  it('should append to base URL with ?', function() {
+    var url = ol.uri.appendParams('http://example.com/foo?', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?k=v');
+  });
+
+  it('should append to base URL with single existing param', function() {
+    var url = ol.uri.appendParams('http://example.com/foo?bar=bam', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?bar=bam&k=v');
+  });
+
+  it('should append to base URL with single existing param and extraneous &', function() {
+    var url = ol.uri.appendParams('http://example.com/foo?bar=bam&', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?bar=bam&k=v');
+  });
+
+  it('should append to base URL with two existing params', function() {
+    var url = ol.uri.appendParams('http://example.com/foo?bar=bam&baz=bat', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?bar=bam&baz=bat&k=v');
+  });
+
+  it('should append to base URL with three existing params last one empty', function() {
+    var url = ol.uri.appendParams('http://example.com/foo?bar=bam&baz=bat&bop=', {
+      k: 'v'
+    });
+    expect(url).to.equal('http://example.com/foo?bar=bam&baz=bat&bop=&k=v');
+  });
+
+});
+
+goog.require('ol.uri');