diff --git a/util/headers.py b/util/headers.py
index 8967dfaa7..353cc61dc 100644
--- a/util/headers.py
+++ b/util/headers.py
@@ -11,7 +11,7 @@ def parse_basic_auth(header_value):
     return None
 
   try:
-    basic_parts = base64.b64decode(parts[1]).split(':')
+    basic_parts = base64.b64decode(parts[1]).split(':', 1)
     if len(basic_parts) != 2:
       return None