diff --git a/contrib/pg_freespacemap/Makefile b/contrib/pg_freespacemap/Makefile
index b48e4b255b..a986ae73d6 100644
--- a/contrib/pg_freespacemap/Makefile
+++ b/contrib/pg_freespacemap/Makefile
@@ -6,7 +6,9 @@ OBJS = \
 	pg_freespacemap.o
 
 EXTENSION = pg_freespacemap
-DATA = pg_freespacemap--1.1.sql pg_freespacemap--1.1--1.2.sql \
+DATA = pg_freespacemap--1.1.sql \
+	pg_freespacemap--1.2--1.3.sql \
+	pg_freespacemap--1.1--1.2.sql \
 	pg_freespacemap--1.0--1.1.sql
 PGFILEDESC = "pg_freespacemap - monitoring of free space map"
 
diff --git a/contrib/pg_freespacemap/meson.build b/contrib/pg_freespacemap/meson.build
index af5d2b8c27..42ff1e74cc 100644
--- a/contrib/pg_freespacemap/meson.build
+++ b/contrib/pg_freespacemap/meson.build
@@ -20,6 +20,7 @@ install_data(
   'pg_freespacemap--1.0--1.1.sql',
   'pg_freespacemap--1.1--1.2.sql',
   'pg_freespacemap--1.1.sql',
+  'pg_freespacemap--1.2--1.3.sql',
   'pg_freespacemap.control',
   kwargs: contrib_data_args,
 )
diff --git a/contrib/pg_freespacemap/pg_freespacemap--1.2--1.3.sql b/contrib/pg_freespacemap/pg_freespacemap--1.2--1.3.sql
new file mode 100644
index 0000000000..7f92c9e92e
--- /dev/null
+++ b/contrib/pg_freespacemap/pg_freespacemap--1.2--1.3.sql
@@ -0,0 +1,13 @@
+/* contrib/pg_freespacemap/pg_freespacemap--1.2--1.3.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pg_freespacemap UPDATE TO '1.3'" to load this file. \quit
+
+CREATE OR REPLACE FUNCTION
+  pg_freespace(rel regclass, blkno OUT bigint, avail OUT int2)
+RETURNS SETOF RECORD
+LANGUAGE SQL PARALLEL SAFE
+BEGIN ATOMIC
+  SELECT blkno, pg_freespace($1, blkno) AS avail
+  FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno;
+END;
diff --git a/contrib/pg_freespacemap/pg_freespacemap.control b/contrib/pg_freespacemap/pg_freespacemap.control
index ac8fc5050a..1992320691 100644
--- a/contrib/pg_freespacemap/pg_freespacemap.control
+++ b/contrib/pg_freespacemap/pg_freespacemap.control
@@ -1,5 +1,5 @@
 # pg_freespacemap extension
 comment = 'examine the free space map (FSM)'
-default_version = '1.2'
+default_version = '1.3'
 module_pathname = '$libdir/pg_freespacemap'
 relocatable = true