diff --git a/src/backend/access/index/indexam.c b/src/backend/access/index/indexam.c
index 6e6af18d47..803bb06398 100644
--- a/src/backend/access/index/indexam.c
+++ b/src/backend/access/index/indexam.c
@@ -872,8 +872,7 @@ index_getprocinfo(Relation irel,
 				 procnum, attnum, RelationGetRelationName(irel));
 
 		fmgr_info_cxt(procId, locinfo, irel->rd_indexcxt);
-		fmgr_info_collation(irel->rd_index->indcollation.values[attnum-1],
-							locinfo);
+		fmgr_info_collation(irel->rd_indcollation[attnum-1], locinfo);
 	}
 
 	return locinfo;