diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 8cd8bf40ac4..72515524199 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1081,7 +1081,7 @@ AS 'pg_create_physical_replication_slot';
 CREATE OR REPLACE FUNCTION pg_create_logical_replication_slot(
     IN slot_name name, IN plugin name,
     IN temporary boolean DEFAULT false,
-    OUT slot_name text, OUT lsn pg_lsn)
+    OUT slot_name name, OUT lsn pg_lsn)
 RETURNS RECORD
 LANGUAGE INTERNAL
 STRICT VOLATILE
diff --git a/src/backend/replication/slotfuncs.c b/src/backend/replication/slotfuncs.c
index 23af32355b7..450f73759f9 100644
--- a/src/backend/replication/slotfuncs.c
+++ b/src/backend/replication/slotfuncs.c
@@ -142,7 +142,7 @@ pg_create_logical_replication_slot(PG_FUNCTION_ARGS)
 	/* build initial snapshot, might take a while */
 	DecodingContextFindStartpoint(ctx);
 
-	values[0] = CStringGetTextDatum(NameStr(MyReplicationSlot->data.name));
+	values[0] = NameGetDatum(&MyReplicationSlot->data.name);
 	values[1] = LSNGetDatum(MyReplicationSlot->data.confirmed_flush);
 
 	/* don't need the decoding context anymore */
diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h
index 66f91a29fcb..547b156c2d9 100644
--- a/src/include/catalog/catversion.h
+++ b/src/include/catalog/catversion.h
@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201807111
+#define CATALOG_VERSION_NO	201807121
 
 #endif
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 00b59fd6a92..a14651010f2 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -9803,7 +9803,7 @@
 { oid => '3786', descr => 'set up a logical replication slot',
   proname => 'pg_create_logical_replication_slot', provolatile => 'v',
   proparallel => 'u', prorettype => 'record', proargtypes => 'name name bool',
-  proallargtypes => '{name,name,bool,text,pg_lsn}',
+  proallargtypes => '{name,name,bool,name,pg_lsn}',
   proargmodes => '{i,i,i,o,o}',
   proargnames => '{slot_name,plugin,temporary,slot_name,lsn}',
   prosrc => 'pg_create_logical_replication_slot' },