diff --git a/radicale/__init__.py b/radicale/__init__.py
index 556ef7c3..64895e49 100644
--- a/radicale/__init__.py
+++ b/radicale/__init__.py
@@ -275,7 +275,7 @@ class Application(object):
             authorization = \
                 authorization.lstrip("Basic").strip().encode("ascii")
             user, password = self.decode(
-                base64.b64decode(authorization), environ).split(":")
+                base64.b64decode(authorization), environ).split(":", 1)
         else:
             user = password = None