diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 40ea629ffe..217f668d15 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -2485,7 +2485,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 	if (objectKind == REINDEX_OBJECT_SYSTEM && concurrent)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-				 errmsg("concurrent reindex of system catalogs is not supported")));
+				 errmsg("cannot reindex system catalogs concurrently")));
 
 	/*
 	 * Get OID of object to reindex, being the database currently being used
@@ -2599,7 +2599,7 @@ ReindexMultipleTables(const char *objectName, ReindexObjectType objectKind,
 			if (!concurrent_warning)
 				ereport(WARNING,
 						(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-						 errmsg("concurrent reindex is not supported for catalog relations, skipping all")));
+						 errmsg("cannot reindex system catalogs concurrently, skipping all")));
 			concurrent_warning = true;
 			continue;
 		}
@@ -2747,7 +2747,7 @@ ReindexRelationConcurrently(Oid relationOid, int options)
 				if (IsCatalogRelationOid(relationOid))
 					ereport(ERROR,
 							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-							 errmsg("cannot reindex a system catalog concurrently")));
+							 errmsg("cannot reindex system catalogs concurrently")));
 
 				/* Open relation to get its indexes */
 				heapRelation = table_open(relationOid, ShareUpdateExclusiveLock);
@@ -2841,7 +2841,7 @@ ReindexRelationConcurrently(Oid relationOid, int options)
 				if (IsCatalogRelationOid(heapId))
 					ereport(ERROR,
 							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-							 errmsg("cannot reindex a system catalog concurrently")));
+							 errmsg("cannot reindex system catalogs concurrently")));
 
 				/* Save the list of relation OIDs in private context */
 				oldcontext = MemoryContextSwitchTo(private_context);
diff --git a/src/test/regress/expected/create_index.out b/src/test/regress/expected/create_index.out
index c8bc6be061..bf39d51f52 100644
--- a/src/test/regress/expected/create_index.out
+++ b/src/test/regress/expected/create_index.out
@@ -2093,19 +2093,19 @@ REINDEX TABLE CONCURRENTLY concur_reindex_tab;
 ERROR:  REINDEX CONCURRENTLY cannot run inside a transaction block
 COMMIT;
 REINDEX TABLE CONCURRENTLY pg_class; -- no catalog relation
-ERROR:  cannot reindex a system catalog concurrently
+ERROR:  cannot reindex system catalogs concurrently
 REINDEX INDEX CONCURRENTLY pg_class_oid_index; -- no catalog index
-ERROR:  cannot reindex a system catalog concurrently
+ERROR:  cannot reindex system catalogs concurrently
 -- These are the toast table and index of pg_authid.
 REINDEX TABLE CONCURRENTLY pg_toast.pg_toast_1260; -- no catalog toast table
-ERROR:  cannot reindex a system catalog concurrently
+ERROR:  cannot reindex system catalogs concurrently
 REINDEX INDEX CONCURRENTLY pg_toast.pg_toast_1260_index; -- no catalog toast index
-ERROR:  cannot reindex a system catalog concurrently
+ERROR:  cannot reindex system catalogs concurrently
 REINDEX SYSTEM CONCURRENTLY postgres; -- not allowed for SYSTEM
-ERROR:  concurrent reindex of system catalogs is not supported
+ERROR:  cannot reindex system catalogs concurrently
 -- Warns about catalog relations
 REINDEX SCHEMA CONCURRENTLY pg_catalog;
-WARNING:  concurrent reindex is not supported for catalog relations, skipping all
+WARNING:  cannot reindex system catalogs concurrently, skipping all
 -- Check the relation status, there should not be invalid indexes
 \d concur_reindex_tab
          Table "public.concur_reindex_tab"