diff --git a/python/tests/test_5_simulation.py b/python/tests/test_5_simulation.py
index 2eaf14490..d0659f087 100644
--- a/python/tests/test_5_simulation.py
+++ b/python/tests/test_5_simulation.py
@@ -95,15 +95,15 @@ class Peer:
         assert not self.members
         self.members.add(self.id)
         for peer in peers:
-            self.add_member(peer.id)
+            self.send_add_member(peer.id)
         self.relay.receive_all()
 
-    def add_member(self, newmember):
+    def send_add_member(self, newmember):
         assert isinstance(newmember, str)
         self.members.add(newmember)
         AddMemberMessage(self, newmember=newmember).send()
 
-    def del_member(self, member):
+    def send_del_member(self, member):
         assert isinstance(member, str)
         assert member in self.members
         msg = DelMemberMessage(self, member=member)
@@ -125,12 +125,12 @@ def test_add_and_remove(relay):
     assert p0.members == p1.members == set([p0.id, p1.id])
 
     # add members
-    p0.add_member(p2.id)
-    p0.add_member(p3.id)
+    p0.send_add_member(p2.id)
+    p0.send_add_member(p3.id)
     relay.receive_all()
     relay.assert_same_members()
 
-    p3.del_member(p0.id)
+    p3.send_del_member(p0.id)
     relay.receive_all()
     relay.assert_same_members()
 
@@ -140,8 +140,8 @@ def test_concurrent_add(relay):
 
     p0.immediate_create_group([p1])
     # concurrent adding and then let base set send a chat message
-    p1.add_member(p2.id)
-    p0.add_member(p3.id)
+    p1.send_add_member(p2.id)
+    p0.send_add_member(p3.id)
 
     # now p0 and p1 send a regular message
     p0.send_chatmessage()
@@ -160,7 +160,7 @@ def test_add_remove_and_stale_old_suddenly_sends(relay):
     p0.immediate_create_group([p1, p2, p3])
 
     # p3 is offline and a member get deleted
-    p0.del_member(p2.id)
+    p0.send_del_member(p2.id)
     relay.receive_all([p0, p1, p2])
 
     # p3 sends a message with old memberlist and goes online