diff --git a/ihatemoney/tests/tests.py b/ihatemoney/tests/tests.py
index 97e9df3d..b6058891 100644
--- a/ihatemoney/tests/tests.py
+++ b/ihatemoney/tests/tests.py
@@ -1153,7 +1153,13 @@ class APITestCase(IhatemoneyTestCase):
         self.assertStatus(200, req)
         self.assertEqual(len(json.loads(req.data.decode('utf-8'))), 1)
 
-        # edit this member
+        # Try to add another member with the same name.
+        req = self.client.post("/api/projects/raclette/members", data={
+            "name": "Alexis"
+        }, headers=self.get_auth("raclette"))
+        self.assertStatus(400, req)
+
+        # edit the member
         req = self.client.put("/api/projects/raclette/members/1", data={
             "name": "Fred",
             "weight": 2,
diff --git a/requirements.txt b/requirements.txt
index 4145851c..64610abd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ flask-mail>=0.8
 Flask-Migrate>=1.8.0
 Flask-script
 flask-babel
-flask-rest
+flask-rest>=1.3
 jinja2>=2.6
 raven
 blinker