diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 72f172bf1f3..47f781905e8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -12942,6 +12942,7 @@ static void
 dumpIndex(Archive *fout, IndxInfo *indxinfo)
 {
 	TableInfo  *tbinfo = indxinfo->indextable;
+	bool		is_constraint = (indxinfo->indexconstraint != 0);
 	PQExpBuffer q;
 	PQExpBuffer delq;
 	PQExpBuffer labelq;
@@ -12959,9 +12960,11 @@ dumpIndex(Archive *fout, IndxInfo *indxinfo)
 	/*
 	 * If there's an associated constraint, don't dump the index per se, but
 	 * do dump any comment for it.	(This is safe because dependency ordering
-	 * will have ensured the constraint is emitted first.)
+	 * will have ensured the constraint is emitted first.)  Note that the
+	 * emitted comment has to be shown as depending on the constraint, not
+	 * the index, in such cases.
 	 */
-	if (indxinfo->indexconstraint == 0)
+	if (!is_constraint)
 	{
 		if (binary_upgrade)
 			binary_upgrade_set_pg_class_oids(fout, q,
@@ -13003,7 +13006,9 @@ dumpIndex(Archive *fout, IndxInfo *indxinfo)
 	dumpComment(fout, labelq->data,
 				tbinfo->dobj.namespace->dobj.name,
 				tbinfo->rolname,
-				indxinfo->dobj.catId, 0, indxinfo->dobj.dumpId);
+				indxinfo->dobj.catId, 0,
+				is_constraint ? indxinfo->indexconstraint :
+				indxinfo->dobj.dumpId);
 
 	destroyPQExpBuffer(q);
 	destroyPQExpBuffer(delq);