diff --git a/federationapi/storage/postgres/assumed_offline_table.go b/federationapi/storage/postgres/assumed_offline_table.go
index a83a934c3..5695d2e54 100644
--- a/federationapi/storage/postgres/assumed_offline_table.go
+++ b/federationapi/storage/postgres/assumed_offline_table.go
@@ -25,8 +25,7 @@ import (
 const assumedOfflineSchema = `
 CREATE TABLE IF NOT EXISTS federationsender_assumed_offline(
     -- The assumed offline server name
-	server_name TEXT NOT NULL,
-	UNIQUE (server_name)
+	server_name TEXT PRIMARY KEY NOT NULL
 );
 `
 
diff --git a/federationapi/storage/sqlite3/assumed_offline_table.go b/federationapi/storage/sqlite3/assumed_offline_table.go
index a6926fc54..ff2afb4da 100644
--- a/federationapi/storage/sqlite3/assumed_offline_table.go
+++ b/federationapi/storage/sqlite3/assumed_offline_table.go
@@ -25,8 +25,7 @@ import (
 const assumedOfflineSchema = `
 CREATE TABLE IF NOT EXISTS federationsender_assumed_offline(
     -- The assumed offline server name
-	server_name TEXT NOT NULL,
-	UNIQUE (server_name)
+	server_name TEXT PRIMARY KEY NOT NULL
 );
 `