diff --git a/static_precompiler/url_converter.py b/static_precompiler/url_converter.py
index 57e8fe8..2a38bb3 100644
--- a/static_precompiler/url_converter.py
+++ b/static_precompiler/url_converter.py
@@ -4,7 +4,7 @@
 
 from . import settings, utils
 
-URL_PATTERN = re.compile(r"url\((.+)\)")
+URL_PATTERN = re.compile(r"url\((.+?)\)")
 
 
 def convert_url(url, source_dir):