diff --git a/manifests/db.pp b/manifests/db.pp
index ae96a97c6..554bea0ea 100644
--- a/manifests/db.pp
+++ b/manifests/db.pp
@@ -74,7 +74,7 @@ class keystone::db (
   $database_max_overflow_real = pick($::keystone::database_max_overflow, $database_max_overflow)
 
   validate_legacy(Oslo::Dbconn, 'validate_re', $database_connection_real,
-    ['^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?'])
+    ['^(sqlite|mysql(\+pymysql)?|postgresql(\+psycopg2)?):\/\/(\S+:\S+@\S+\/\S+)?'])
 
   oslo::db { 'keystone_config':
     db_max_retries          => $database_db_max_retries,
diff --git a/releasenotes/notes/allow-drivername-for-postgresql-daa276a598844884.yaml b/releasenotes/notes/allow-drivername-for-postgresql-daa276a598844884.yaml
new file mode 100644
index 000000000..a2a13c3a1
--- /dev/null
+++ b/releasenotes/notes/allow-drivername-for-postgresql-daa276a598844884.yaml
@@ -0,0 +1,3 @@
+---
+features:
+  - Allow to specify drivername for postgres db