diff --git a/src/ol/source/ImageArcGISRest.js b/src/ol/source/ImageArcGISRest.js
index ea67456744..db617cb67e 100644
--- a/src/ol/source/ImageArcGISRest.js
+++ b/src/ol/source/ImageArcGISRest.js
@@ -9,7 +9,7 @@ import EventType from '../events/EventType.js';
 import {containsExtent, getHeight, getWidth} from '../extent.js';
 import _ol_obj_ from '../obj.js';
 import ImageSource from '../source/Image.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -218,7 +218,7 @@ ImageArcGISRest.prototype.getRequestUrl_ = function(extent, size, pixelRatio, pr
   if (modifiedUrl == url) {
     assert(false, 50); // `options.featureTypes` should be an Array
   }
-  return _ol_uri_.appendParams(modifiedUrl, params);
+  return appendParams(modifiedUrl, params);
 };
 
 
diff --git a/src/ol/source/ImageMapGuide.js b/src/ol/source/ImageMapGuide.js
index a16a16478a..4b128ef038 100644
--- a/src/ol/source/ImageMapGuide.js
+++ b/src/ol/source/ImageMapGuide.js
@@ -8,7 +8,7 @@ import EventType from '../events/EventType.js';
 import {containsExtent, getCenter, getHeight, getWidth, scaleFromCenter} from '../extent.js';
 import _ol_obj_ from '../obj.js';
 import ImageSource from '../source/Image.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -224,7 +224,7 @@ ImageMapGuide.prototype.getUrl = function(baseUrl, params, extent, size, project
     'SETVIEWCENTERY': center[1]
   };
   _ol_obj_.assign(baseParams, params);
-  return _ol_uri_.appendParams(baseUrl, baseParams);
+  return appendParams(baseUrl, baseParams);
 };
 
 
diff --git a/src/ol/source/ImageWMS.js b/src/ol/source/ImageWMS.js
index 8d240cbe26..4db630d0a2 100644
--- a/src/ol/source/ImageWMS.js
+++ b/src/ol/source/ImageWMS.js
@@ -15,7 +15,7 @@ import _ol_reproj_ from '../reproj.js';
 import ImageSource from '../source/Image.js';
 import WMSServerType from '../source/WMSServerType.js';
 import _ol_string_ from '../string.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -308,7 +308,7 @@ ImageWMS.prototype.getRequestUrl_ = function(extent, size, pixelRatio, projectio
   }
   params['BBOX'] = bbox.join(',');
 
-  return _ol_uri_.appendParams(/** @type {string} */ (this.url_), params);
+  return appendParams(/** @type {string} */ (this.url_), params);
 };
 
 
diff --git a/src/ol/source/TileArcGISRest.js b/src/ol/source/TileArcGISRest.js
index af0da1b4ed..e1f196d0af 100644
--- a/src/ol/source/TileArcGISRest.js
+++ b/src/ol/source/TileArcGISRest.js
@@ -8,7 +8,7 @@ import _ol_obj_ from '../obj.js';
 import _ol_size_ from '../size.js';
 import TileImage from '../source/TileImage.js';
 import _ol_tilecoord_ from '../tilecoord.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -125,7 +125,7 @@ TileArcGISRest.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExte
   const modifiedUrl = url
     .replace(/MapServer\/?$/, 'MapServer/export')
     .replace(/ImageServer\/?$/, 'ImageServer/exportImage');
-  return _ol_uri_.appendParams(modifiedUrl, params);
+  return appendParams(modifiedUrl, params);
 };
 
 
diff --git a/src/ol/source/TileWMS.js b/src/ol/source/TileWMS.js
index 23180d8a21..eaa1df5706 100644
--- a/src/ol/source/TileWMS.js
+++ b/src/ol/source/TileWMS.js
@@ -15,7 +15,7 @@ import TileImage from '../source/TileImage.js';
 import WMSServerType from '../source/WMSServerType.js';
 import _ol_tilecoord_ from '../tilecoord.js';
 import _ol_string_ from '../string.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -250,7 +250,7 @@ TileWMS.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExtent,
     const index = modulo(_ol_tilecoord_.hash(tileCoord), urls.length);
     url = urls[index];
   }
-  return _ol_uri_.appendParams(url, params);
+  return appendParams(url, params);
 };
 
 
diff --git a/src/ol/source/WMTS.js b/src/ol/source/WMTS.js
index 125201b51b..182f34ce8a 100644
--- a/src/ol/source/WMTS.js
+++ b/src/ol/source/WMTS.js
@@ -10,7 +10,7 @@ import {get as getProjection, equivalent, transformExtent} from '../proj.js';
 import TileImage from '../source/TileImage.js';
 import WMTSRequestEncoding from '../source/WMTSRequestEncoding.js';
 import {createFromCapabilitiesMatrixSet} from '../tilegrid/WMTS.js';
-import _ol_uri_ from '../uri.js';
+import {appendParams} from '../uri.js';
 
 /**
  * @classdesc
@@ -114,7 +114,7 @@ const WMTS = function(options) {
     // special template params
 
     template = (requestEncoding == WMTSRequestEncoding.KVP) ?
-      _ol_uri_.appendParams(template, context) :
+      appendParams(template, context) :
       template.replace(/\{(\w+?)\}/g, function(m, p) {
         return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;
       });
@@ -138,7 +138,7 @@ const WMTS = function(options) {
           _ol_obj_.assign(localContext, dimensions);
           let url = template;
           if (requestEncoding == WMTSRequestEncoding.KVP) {
-            url = _ol_uri_.appendParams(url, localContext);
+            url = 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
index 0fe4f0731a..f2264156c1 100644
--- a/src/ol/uri.js
+++ b/src/ol/uri.js
@@ -1,7 +1,6 @@
 /**
  * @module ol/uri
  */
-const _ol_uri_ = {};
 
 
 /**
@@ -12,7 +11,7 @@ const _ol_uri_ = {};
  *     and the values are arbitrary types or arrays.
  * @return {string} The new URI.
  */
-_ol_uri_.appendParams = function(uri, params) {
+export function appendParams(uri, params) {
   const keyParams = [];
   // Skip any null or undefined parameter values
   Object.keys(params).forEach(function(k) {
@@ -26,5 +25,4 @@ _ol_uri_.appendParams = function(uri, params) {
   // append ? or & depending on whether uri has existing parameters
   uri = uri.indexOf('?') === -1 ? uri + '?' : uri + '&';
   return uri + qs;
-};
-export default _ol_uri_;
+}
diff --git a/test/spec/ol/uri.test.js b/test/spec/ol/uri.test.js
index 3f0cbacaf7..24eb203238 100644
--- a/test/spec/ol/uri.test.js
+++ b/test/spec/ol/uri.test.js
@@ -1,10 +1,10 @@
-import _ol_uri_ from '../../../src/ol/uri.js';
+import {appendParams} from '../../../src/ol/uri.js';
 
 
 describe('ol.uri.appendParams()', function() {
 
   it('should append empty STYLES with =', function() {
-    const url = _ol_uri_.appendParams('http://example.com/foo', {
+    const url = appendParams('http://example.com/foo', {
       SERVICE: 'WMS',
       STYLES: ''
     });
@@ -12,56 +12,56 @@ describe('ol.uri.appendParams()', function() {
   });
 
   it('should URL encode values but not names', function() {
-    const url = _ol_uri_.appendParams('http://example.com/foo', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo?', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo?bar=bam', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo?bar=bam&', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo?bar=bam&baz=bat', {
+    const url = 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() {
-    const url = _ol_uri_.appendParams('http://example.com/foo?bar=bam&baz=bat&bop=', {
+    const url = 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');
   });
 
   it('should not append null or undefined parameters to the url', function() {
-    const url = _ol_uri_.appendParams('http://example.com/foo', {
+    const url = appendParams('http://example.com/foo', {
       a: '1',
       b: null,
       c: undefined