diff --git a/cloudmonkey/requester.py b/cloudmonkey/requester.py
index cf082aa9..f8c038d1 100644
--- a/cloudmonkey/requester.py
+++ b/cloudmonkey/requester.py
@@ -202,7 +202,7 @@ def sign_request(params, secret_key):
         hash_str = "&".join(
             ["=".join(
                 [r[0].lower(),
-                 urllib.quote_plus(str(r[1])).lower()
+                 urllib.quote_plus(str(r[1]), safe="*").lower()
                  .replace("+", "%20").replace("%3A", ":")]
             ) for r in request]
         )