diff --git a/package.json b/package.json
index 3f6e9199e0..4b85cb5cb8 100644
--- a/package.json
+++ b/package.json
@@ -111,11 +111,13 @@
     },
     {
       "module": "pixelworks",
+      "import": "Processor",
       "browserify": true
     },
     {
       "module": "vector-tile",
       "name": "vectortile",
+      "import": "VectorTile",
       "browserify": true
     }
   ]
diff --git a/src/ol/format/mvt.js b/src/ol/format/mvt.js
index ca0a7c4f2b..9745c59bf4 100644
--- a/src/ol/format/mvt.js
+++ b/src/ol/format/mvt.js
@@ -4,7 +4,7 @@ goog.provide('ol.format.MVT');
 
 goog.require('ol');
 goog.require('ol.ext.PBF');
-goog.require('ol.ext.vectortile');
+goog.require('ol.ext.vectortile.VectorTile');
 goog.require('ol.format.Feature');
 goog.require('ol.format.FormatType');
 goog.require('ol.geom.GeometryLayout');
diff --git a/src/ol/source/raster.js b/src/ol/source/raster.js
index 0ef94c8625..bacf4fee27 100644
--- a/src/ol/source/raster.js
+++ b/src/ol/source/raster.js
@@ -7,7 +7,7 @@ goog.require('ol.dom');
 goog.require('ol.events');
 goog.require('ol.events.Event');
 goog.require('ol.events.EventType');
-goog.require('ol.ext.pixelworks');
+goog.require('ol.ext.pixelworks.Processor');
 goog.require('ol.extent');
 goog.require('ol.layer.Image');
 goog.require('ol.layer.Tile');
diff --git a/tasks/build-ext.js b/tasks/build-ext.js
index 72b58ea039..907f2f354a 100644
--- a/tasks/build-ext.js
+++ b/tasks/build-ext.js
@@ -29,6 +29,7 @@ function getExternalModules() {
         module: item.module,
         name: item.name !== undefined ? item.name : item.module,
         main: require.resolve(item.module),
+        import: item.import,
         browserify: item.browserify !== undefined ? item.browserify : false
       };
     }
@@ -43,10 +44,16 @@ function getExternalModules() {
  *     wrapped module.
  */
 function wrapModule(mod, callback) {
+  var name = 'ol.ext.' + mod.name;
+  var member = 'module.exports';
+  if (mod.import) {
+    name += '.' + mod.import;
+    member += '.' + mod.import;
+  }
   var wrap = function(code) {
-    return 'goog.provide(\'ol.ext.' + mod.name + '\');\n' +
+    return 'goog.provide(\'' + name + '\');\n' +
         '/** @typedef {function(*)} */\n' +
-        'ol.ext.' + mod.name + ';\n' +
+        name + ';\n' +
         '(function() {\n' +
         'var exports = {};\n' +
         'var module = {exports: exports};\n' +
@@ -60,7 +67,7 @@ function wrapModule(mod, callback) {
         'strictModuleDepCheck, suspiciousCode, undefinedNames, ' +
         'undefinedVars, unknownDefines, unusedLocalVariables, uselessCode, visibility}\n' +
         ' */\n' + code + '\n' +
-        'ol.ext.' + mod.name + ' = module.exports;\n' +
+        name + ' = ' + member + ';\n' +
         '})();\n';
   };
 
diff --git a/test/spec/ol/format/mvt.test.js b/test/spec/ol/format/mvt.test.js
index 8277dbbf50..ded61e1efe 100644
--- a/test/spec/ol/format/mvt.test.js
+++ b/test/spec/ol/format/mvt.test.js
@@ -2,7 +2,7 @@ goog.provide('ol.test.format.MVT');
 
 goog.require('ol.Feature');
 goog.require('ol.ext.PBF');
-goog.require('ol.ext.vectortile');
+goog.require('ol.ext.vectortile.VectorTile');
 goog.require('ol.format.MVT');
 goog.require('ol.geom.Point');
 goog.require('ol.render.Feature');
diff --git a/transforms/module.js b/transforms/module.js
index e3c276ad41..8a81705f1b 100644
--- a/transforms/module.js
+++ b/transforms/module.js
@@ -16,8 +16,10 @@ function resolve(fromName, toName) {
   if (toParts[0] === 'ol' && toParts[1] === 'ext') {
     let name = toParts[2];
     let packageName;
+    let imported;
     for (let i = 0, ii = pkg.ext.length; i < ii; ++i) {
       const dependency = pkg.ext[i];
+      imported = dependency.import;
       if (dependency.module === name) {
         packageName = name;
         break;
@@ -29,7 +31,11 @@ function resolve(fromName, toName) {
     if (!packageName) {
       throw new Error(`Can't find package name for ${toName}`);
     }
-    return packageName;
+    if (imported) {
+      return [packageName, imported];
+    } else {
+      return packageName;
+    }
   }
   const fromLength = fromParts.length;
   let commonDepth = 1;
@@ -186,12 +192,18 @@ module.exports = function(info, api) {
       }
       const renamed = rename(name);
       replacements[name] = renamed;
-      imports.push(
-        j.importDeclaration(
-          [j.importDefaultSpecifier(j.identifier(renamed))],
-          j.literal(resolve(provide, name))
-        )
-      );
+      const resolved = resolve(provide, name);
+      let specifier, source;
+      if (Array.isArray(resolved)) {
+        // import {imported as renamed} from 'source';
+        specifier = j.importSpecifier(j.identifier(resolved[1]), j.identifier(renamed));
+        source = resolved[0];
+      } else {
+        // import renamed from 'source';
+        specifier = j.importDefaultSpecifier(j.identifier(renamed));
+        source = resolved;
+      }
+      imports.push(j.importDeclaration([specifier], j.literal(source)));
     })
     .remove();