diff --git a/utils/build/build.py b/utils/build/build.py
index b9ee4806b469de776a25fbfdd6bbba382badf281..70210d564a7b62cdeb560652f6ef18939e9962ec 100644
--- a/utils/build/build.py
+++ b/utils/build/build.py
@@ -19,6 +19,7 @@ def main(argv=None):
 	parser = argparse.ArgumentParser()
 	parser.add_argument('--include', action='append', required=True)
 	parser.add_argument('--externs', action='append', default=['externs/common.js'])
+	parser.add_argument('--amd', action='store_true', default=False)
 	parser.add_argument('--minify', action='store_true', default=False)
 	parser.add_argument('--output', default='../../build/three.js')
 	parser.add_argument('--sourcemaps', action='store_true', default=False)
@@ -44,6 +45,9 @@ def main(argv=None):
 	tmp = open(path, 'w')
 	sources = []
 
+	if args.amd:
+		tmp.write('( function ( root, factory ) {\n\n\tif ( typeof define === \'function\' && define.amd ) {\n\n\t\tdefine( factory );\n\n\t} else {\n\n\t\troot.THREE = factory();\n\n\t}\n\n}( this, function () {\n\n')
+
 	for include in args.include:
 		with open('includes/' + include + '.json','r') as f:
 			files = json.load(f)
@@ -54,6 +58,9 @@ def main(argv=None):
 				tmp.write(f.read())
 				tmp.write('\n')
 
+	if args.amd:
+		tmp.write('return THREE;\n\n} ) );')
+
 	tmp.close()
 
 	# save