diff --git a/src/cssmin.py b/src/cssmin.py
index ff79e39..857163f 100644
--- a/src/cssmin.py
+++ b/src/cssmin.py
@@ -108,7 +108,8 @@ def normalize_rgb_colors_to_hex(css):
     regex = re.compile(r"rgb\s*\(\s*([0-9,\s]+)\s*\)")
     match = regex.search(css)
     while match:
-        colors = map(lambda s: s.strip(), match.group(1).split(","))
+        split_values = re.split(",| ", match.group(1))
+        colors = map(lambda s: s.strip(), split_values)
         hexcolor = '#%.2x%.2x%.2x' % tuple(map(int, colors))
         css = css.replace(match.group(), hexcolor)
         match = regex.search(css)