diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index eae5da8b6e..d551ada325 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -22,6 +22,7 @@ AclItem
 AclMaskHow
 AclMode
 AclResult
+AcquireSampleRowsFunc
 ActionList
 ActiveSnapshotElt
 AddForeignUpdateTargets_function