diff --git a/src/namecheap/client.py b/src/namecheap/client.py
index b266460..331d912 100644
--- a/src/namecheap/client.py
+++ b/src/namecheap/client.py
@@ -54,7 +54,7 @@ def _make_url(self, command, args):
         flat_args = ""
 
         for k, v in args.items():
-            flat_args += "&{0}={1}".format(k, v)
+            flat_args += "&{0}={1}".format(k, urllib2.quote(str(v)))
 
         url = "{0}?ApiUser={1}&ApiKey={2}&UserName={3}&ClientIP={4}" \
               "&Command={5}{6}".format(