diff --git a/scss/cssdefs.py b/scss/cssdefs.py
index 79be7b4b..6b4f5b7c 100644
--- a/scss/cssdefs.py
+++ b/scss/cssdefs.py
@@ -449,7 +449,11 @@ def determine_encoding(buf):
 
 def _unescape_one(match):
     if match.group(1) is not None:
-        return six.unichr(int(match.group(1), 16))
+        try:
+            return six.unichr(int(match.group(1), 16))
+        except ValueError:
+            return (r'\U%08x' % int(match.group(1), 16)).decode(
+                'unicode-escape')
     elif match.group(2) is not None:
         return match.group(2)
     else: