diff --git a/synapse/storage/databases/main/profile.py b/synapse/storage/databases/main/profile.py
index 12f984d433..4503c49997 100644
--- a/synapse/storage/databases/main/profile.py
+++ b/synapse/storage/databases/main/profile.py
@@ -99,9 +99,12 @@ class ProfileWorkerStore(SQLBaseStore):
             else:
                 raise
 
-    async def create_profile(self, user_localpart: str) -> None:
+    async def create_profile(self, user_id: str) -> None:
+        user_localpart = UserID.from_string(user_id).localpart
         await self.db_pool.simple_insert(
-            table="profiles", values={"user_id": user_localpart}, desc="create_profile"
+            table="profiles",
+            values={"user_id": user_localpart, "full_user_id": user_id},
+            desc="create_profile",
         )
 
     async def set_profile_displayname(
diff --git a/tests/handlers/test_profile.py b/tests/handlers/test_profile.py
index 2cf3fd2119..9fb2a1ea8a 100644
--- a/tests/handlers/test_profile.py
+++ b/tests/handlers/test_profile.py
@@ -166,7 +166,7 @@ class ProfileTestCase(unittest.HomeserverTestCase):
         )
 
     def test_incoming_fed_query(self) -> None:
-        self.get_success(self.store.create_profile("caroline"))
+        self.get_success(self.store.create_profile("@caroline:test"))
         self.get_success(self.store.set_profile_displayname("caroline", "Caroline"))
 
         response = self.get_success(
diff --git a/tests/storage/test_main.py b/tests/storage/test_main.py
index 5806cb0e4b..f83c1e6d62 100644
--- a/tests/storage/test_main.py
+++ b/tests/storage/test_main.py
@@ -29,7 +29,7 @@ class DataStoreTestCase(unittest.HomeserverTestCase):
 
     def test_get_users_paginate(self) -> None:
         self.get_success(self.store.register_user(self.user.to_string(), "pass"))
-        self.get_success(self.store.create_profile(self.user.localpart))
+        self.get_success(self.store.create_profile(self.user.to_string()))
         self.get_success(
             self.store.set_profile_displayname(self.user.localpart, self.displayname)
         )
diff --git a/tests/storage/test_profile.py b/tests/storage/test_profile.py
index 136352f838..4af733d6ba 100644
--- a/tests/storage/test_profile.py
+++ b/tests/storage/test_profile.py
@@ -27,7 +27,7 @@ class ProfileStoreTestCase(unittest.HomeserverTestCase):
         self.u_frank = UserID.from_string("@frank:test")
 
     def test_displayname(self) -> None:
-        self.get_success(self.store.create_profile(self.u_frank.localpart))
+        self.get_success(self.store.create_profile(self.u_frank.to_string()))
 
         self.get_success(
             self.store.set_profile_displayname(self.u_frank.localpart, "Frank")
@@ -54,7 +54,7 @@ class ProfileStoreTestCase(unittest.HomeserverTestCase):
         )
 
     def test_avatar_url(self) -> None:
-        self.get_success(self.store.create_profile(self.u_frank.localpart))
+        self.get_success(self.store.create_profile(self.u_frank.to_string()))
 
         self.get_success(
             self.store.set_profile_avatar_url(