diff --git a/config.js b/config.js
index 6468ec4..c89ee5c 100644
--- a/config.js
+++ b/config.js
@@ -29,13 +29,12 @@ module.exports = {
     sourcemap: true
   },
   browserify: {
-    basedir: './src/js',
     debug: true,
     fullPaths: false,
     entries: [es6ify.runtime],
-    prebundle: function(bundle) {
-      bundle.transform(require('./lib/canopy-transform'));
-      bundle.transform(es6ify.configure(/^(?!.*node_modules)+.+\.js$/));
-    }
+  },
+  prebundle: function(bundle) {
+    bundle.transform(require('./lib/canopy-transform'));
+    bundle.transform(es6ify.configure(/^(?!.*node_modules)+.+\.js$/));
   }
 };
diff --git a/gulpfile.js b/gulpfile.js
index 577d358..2e83856 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -91,7 +91,7 @@ gulp.task('scripts', function() {
     .pipe(tap(function(file) {
       var bundler = browserify(config.browserify);
 
-      config.browserify.prebundle(bundler);
+      config.prebundle(bundler);
 
       bundler.add(file.path);
 
diff --git a/karma.conf.js b/karma.conf.js
index 6169175..5c62907 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -21,6 +21,10 @@ module.exports = function(karma) {
     browsers: ['Chrome'],
     autoWatch: true,
     singleRun: false,
-    browserify: config.browserify
+    browserify: _.extend({
+      configure: function(bundle) {
+        config.prebundle(bundle);
+      }
+    }, config.browserify)
   });
 };
diff --git a/package.json b/package.json
index 9a88671..1ada2c6 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "gulp-wrap": "^0.11.0",
     "jasmine-core": "^2.3.4",
     "karma": "^0.13.14",
-    "karma-browserify": "^1.0.1",
+    "karma-browserify": "^4.4.0",
     "karma-chrome-launcher": "^0.2.1",
     "karma-jasmine": "^0.3.1",
     "karma-notify-reporter": "^0.1.1",
diff --git a/spec/parser/javascript/any_character_spec.js b/spec/parser/javascript/any_character_spec.js
index d55492e..72981fb 100644
--- a/spec/parser/javascript/any_character_spec.js
+++ b/spec/parser/javascript/any_character_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 
 describe('parser/javascript/any_character.js', function() {
 
diff --git a/spec/parser/javascript/charset_escape_spec.js b/spec/parser/javascript/charset_escape_spec.js
index c1b1dd2..c4741ba 100644
--- a/spec/parser/javascript/charset_escape_spec.js
+++ b/spec/parser/javascript/charset_escape_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/charset_range_spec.js b/spec/parser/javascript/charset_range_spec.js
index 708111d..c1992bb 100644
--- a/spec/parser/javascript/charset_range_spec.js
+++ b/spec/parser/javascript/charset_range_spec.js
@@ -1,5 +1,5 @@
-import javascript from 'src/js/parser/javascript/parser.js';
-import util from 'src/js/util.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
+import util from '../../../src/js/util.js';
 import _ from 'lodash';
 
 describe('parser/javascript/charset_range.js', function() {
diff --git a/spec/parser/javascript/charset_spec.js b/spec/parser/javascript/charset_spec.js
index 1a11cd9..2e74b50 100644
--- a/spec/parser/javascript/charset_spec.js
+++ b/spec/parser/javascript/charset_spec.js
@@ -1,6 +1,6 @@
-import javascript from 'src/js/parser/javascript/parser.js';
-import Node from 'src/js/parser/javascript/node.js';
-import util from 'src/js/util.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
+import Node from '../../../src/js/parser/javascript/node.js';
+import util from '../../../src/js/util.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/escape_spec.js b/spec/parser/javascript/escape_spec.js
index dfd497f..31dab62 100644
--- a/spec/parser/javascript/escape_spec.js
+++ b/spec/parser/javascript/escape_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/literal_spec.js b/spec/parser/javascript/literal_spec.js
index 0643063..1e57b73 100644
--- a/spec/parser/javascript/literal_spec.js
+++ b/spec/parser/javascript/literal_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import Snap from 'snapsvg';
 
 describe('parser/javascript/literal.js', function() {
diff --git a/spec/parser/javascript/match_fragment_spec.js b/spec/parser/javascript/match_fragment_spec.js
index baa3f74..9d949c1 100644
--- a/spec/parser/javascript/match_fragment_spec.js
+++ b/spec/parser/javascript/match_fragment_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/match_spec.js b/spec/parser/javascript/match_spec.js
index 7ea5e90..a8c8e75 100644
--- a/spec/parser/javascript/match_spec.js
+++ b/spec/parser/javascript/match_spec.js
@@ -1,5 +1,5 @@
-import javascript from 'src/js/parser/javascript/parser.js';
-import util from 'src/js/util.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
+import util from '../../../src/js/util.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/node_spec.js b/spec/parser/javascript/node_spec.js
index 6e7478a..de378fa 100644
--- a/spec/parser/javascript/node_spec.js
+++ b/spec/parser/javascript/node_spec.js
@@ -1,4 +1,4 @@
-import Node from 'src/js/parser/javascript/node.js';
+import Node from '../../../src/js/parser/javascript/node.js';
 import Snap from 'snapsvg';
 
 describe('parser/javascript/node.js', function() {
diff --git a/spec/parser/javascript/parser_state_spec.js b/spec/parser/javascript/parser_state_spec.js
index 6467433..37c1f46 100644
--- a/spec/parser/javascript/parser_state_spec.js
+++ b/spec/parser/javascript/parser_state_spec.js
@@ -1,4 +1,4 @@
-import ParserState from 'src/js/parser/javascript/parser_state.js';
+import ParserState from '../../../src/js/parser/javascript/parser_state.js';
 
 describe('parser/javascript/parser_state.js', function() {
 
diff --git a/spec/parser/javascript/regexp_spec.js b/spec/parser/javascript/regexp_spec.js
index 35d714c..5c17009 100644
--- a/spec/parser/javascript/regexp_spec.js
+++ b/spec/parser/javascript/regexp_spec.js
@@ -1,5 +1,5 @@
-import javascript from 'src/js/parser/javascript/parser.js';
-import util from 'src/js/util.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
+import util from '../../../src/js/util.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/repeat_any_spec.js b/spec/parser/javascript/repeat_any_spec.js
index db24caf..7612f61 100644
--- a/spec/parser/javascript/repeat_any_spec.js
+++ b/spec/parser/javascript/repeat_any_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 
 describe('parser/javascript/repeat_any.js', function() {
 
diff --git a/spec/parser/javascript/repeat_optional_spec.js b/spec/parser/javascript/repeat_optional_spec.js
index 0c84058..761f8fb 100644
--- a/spec/parser/javascript/repeat_optional_spec.js
+++ b/spec/parser/javascript/repeat_optional_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 
 describe('parser/javascript/repeat_optional.js', function() {
 
diff --git a/spec/parser/javascript/repeat_required_spec.js b/spec/parser/javascript/repeat_required_spec.js
index 1da66aa..a386da6 100644
--- a/spec/parser/javascript/repeat_required_spec.js
+++ b/spec/parser/javascript/repeat_required_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 
 describe('parser/javascript/repeat_required.js', function() {
 
diff --git a/spec/parser/javascript/repeat_spec.js b/spec/parser/javascript/repeat_spec.js
index fa803de..f3fc132 100644
--- a/spec/parser/javascript/repeat_spec.js
+++ b/spec/parser/javascript/repeat_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript/repeat_spec_spec.js b/spec/parser/javascript/repeat_spec_spec.js
index 4d79cc7..f61c542 100644
--- a/spec/parser/javascript/repeat_spec_spec.js
+++ b/spec/parser/javascript/repeat_spec_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 
 describe('parser/javascript/repeat_spec.js', function() {
 
diff --git a/spec/parser/javascript/root_spec.js b/spec/parser/javascript/root_spec.js
index bae492b..a7dd1ec 100644
--- a/spec/parser/javascript/root_spec.js
+++ b/spec/parser/javascript/root_spec.js
@@ -1,4 +1,4 @@
-import javascript from 'src/js/parser/javascript/parser.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
 import Snap from 'snapsvg';
 import _ from 'lodash';
 
diff --git a/spec/parser/javascript/subexp_spec.js b/spec/parser/javascript/subexp_spec.js
index 43b6281..cd55938 100644
--- a/spec/parser/javascript/subexp_spec.js
+++ b/spec/parser/javascript/subexp_spec.js
@@ -1,5 +1,5 @@
-import javascript from 'src/js/parser/javascript/parser.js';
-import Node from 'src/js/parser/javascript/node.js';
+import javascript from '../../../src/js/parser/javascript/parser.js';
+import Node from '../../../src/js/parser/javascript/node.js';
 import _ from 'lodash';
 import Snap from 'snapsvg';
 
diff --git a/spec/parser/javascript_spec.js b/spec/parser/javascript_spec.js
index 72d90b3..ce18a7b 100644
--- a/spec/parser/javascript_spec.js
+++ b/spec/parser/javascript_spec.js
@@ -1,5 +1,5 @@
-import Parser from 'src/js/parser/javascript.js';
-import regexpParser from 'src/js/parser/javascript/grammar.peg';
+import Parser from '../../src/js/parser/javascript.js';
+import regexpParser from '../../src/js/parser/javascript/grammar.peg';
 import Snap from 'snapsvg';
 
 describe('parser/javascript.js', function() {
diff --git a/spec/regexper_spec.js b/spec/regexper_spec.js
index 05705d8..9edbb47 100644
--- a/spec/regexper_spec.js
+++ b/spec/regexper_spec.js
@@ -1,6 +1,6 @@
-import util from 'src/js/util.js';
-import Regexper from 'src/js/regexper.js';
-import Parser from 'src/js/parser/javascript.js';
+import util from '../src/js/util.js';
+import Regexper from '../src/js/regexper.js';
+import Parser from '../src/js/parser/javascript.js';
 import Snap from 'snapsvg';
 
 describe('regexper.js', function() {
diff --git a/spec/util_spec.js b/spec/util_spec.js
index b555364..42382dc 100644
--- a/spec/util_spec.js
+++ b/spec/util_spec.js
@@ -1,4 +1,4 @@
-import util from 'src/js/util.js';
+import util from '../src/js/util.js';
 
 describe('util.js', function() {