diff --git a/disco/api/client.py b/disco/api/client.py
index 02e4c11..05bb594 100644
--- a/disco/api/client.py
+++ b/disco/api/client.py
@@ -4,7 +4,7 @@ import warnings
 
 from six.moves.urllib.parse import quote
 
-from disco.api.http import Routes, HTTPClient
+from disco.api.http import Routes, HTTPClient, to_bytes
 from disco.util.logging import LoggingClass
 from disco.util.sanitize import S
 from disco.types.user import User
@@ -26,7 +26,7 @@ def optional(**kwargs):
 
 
 def _reason_header(value):
-    return optional(**{'X-Audit-Log-Reason': quote(value)})
+    return optional(**{'X-Audit-Log-Reason': quote(to_bytes(value))})
 
 
 class APIClient(LoggingClass):
diff --git a/tests/test_reason.py b/tests/test_reason.py
new file mode 100644
index 0000000..8d9b39c
--- /dev/null
+++ b/tests/test_reason.py
@@ -0,0 +1,11 @@
+from unittest import TestCase
+from utils import TestAPIClient
+
+
+class TestReason(TestCase):
+    def test_set_unicode_reason(self):
+        api = TestAPIClient()
+        api.guilds_channels_modify(1, 2, 3, reason=u'yo \U0001F4BF test')
+
+        _, kwargs = api.http.calls[0]
+        self.assertEquals(kwargs['headers']['X-Audit-Log-Reason'], 'yo%20%F0%9F%92%BF%20test')
diff --git a/tests/utils.py b/tests/utils.py
new file mode 100644
index 0000000..74f9766
--- /dev/null
+++ b/tests/utils.py
@@ -0,0 +1,15 @@
+from disco.api.client import APIClient
+
+
+class CallContainer(object):
+    def __init__(self):
+        self.calls = []
+
+    def __call__(self, *args, **kwargs):
+        self.calls.append((args, kwargs))
+
+
+class TestAPIClient(APIClient):
+    def __init__(self):
+        self.client = None
+        self.http = CallContainer()