diff --git a/.zuul.yaml b/.zuul.yaml
new file mode 100644
index 0000000..f42aa59
--- /dev/null
+++ b/.zuul.yaml
@@ -0,0 +1,5 @@
+- project:
+    templates:
+      - openstack-python-jobs
+      - openstack-python36-jobs
+      - openstack-python37-jobs
diff --git a/setup.cfg b/setup.cfg
index d580304..78237d5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,7 +17,10 @@ classifier =
         Operating System :: OS Independent
         Programming Language :: Python
         Programming Language :: Python :: 2.7
+        Programming Language :: Python :: 3
         Programming Language :: Python :: 3.5
+        Programming Language :: Python :: 3.6
+        Programming Language :: Python :: 3.7
         Programming Language :: Python :: Implementation :: CPython
         Programming Language :: Python :: Implementation :: PyPy
         License :: OSI Approved :: MIT License
diff --git a/wsme/api.py b/wsme/api.py
index e5fe7c6..67263a0 100644
--- a/wsme/api.py
+++ b/wsme/api.py
@@ -179,7 +179,7 @@ class signature(object):
         fd.return_type = self.return_type
         fd.set_options(**self.options)
         if self.arg_types:
-                fd.set_arg_types(argspec, self.arg_types)
+            fd.set_arg_types(argspec, self.arg_types)
         return func