diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index 39927be41e..53ecda3d2e 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -429,7 +429,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       Although most forms of <literal>ADD
       <replaceable class="parameter">table_constraint</replaceable></literal>
       require an <literal>ACCESS EXCLUSIVE</literal> lock, <literal>ADD
-      FOREIGN KEY</literal> requires only a <literal>SHARE ROW
+      CHECK</literal> and <literal>ADD
+      FOREIGN KEY</literal> require only a <literal>SHARE ROW
       EXCLUSIVE</literal> lock.  Note that <literal>ADD FOREIGN KEY</literal>
       also acquires a <literal>SHARE ROW EXCLUSIVE</literal> lock on the
       referenced table, in addition to the lock on the table on which the
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 97cc9fd6ec..6e0ff5c08f 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -4233,6 +4233,15 @@ AlterTableGetLockLevel(List *cmds)
 							 */
 							cmd_lockmode = AccessExclusiveLock;
 							break;
+
+						case CONSTR_CHECK:
+
+							/*
+							 * We prevent other writers from accessing table.
+							 */
+							cmd_lockmode = ShareRowExclusiveLock;
+							break;
+
 						case CONSTR_FOREIGN:
 
 							/*
diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index f81bdf513b..8bf6e284bb 100644
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -2729,6 +2729,15 @@ select * from my_locks order by 1;
  alterlock_pkey  | AccessShareLock
 (4 rows)
 
+rollback;
+begin;
+alter table alterlock2 add check (f1 > 0) not valid;
+select * from my_locks order by 1;
+  relname   |     max_lockmode      
+------------+-----------------------
+ alterlock2 | ShareRowExclusiveLock
+(1 row)
+
 rollback;
 begin;
 alter table alterlock2
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index dc0200adcb..a65c9a7465 100644
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -1744,6 +1744,11 @@ alter table alterlock2 add foreign key (f1) references alterlock (f1);
 select * from my_locks order by 1;
 rollback;
 
+begin;
+alter table alterlock2 add check (f1 > 0) not valid;
+select * from my_locks order by 1;
+rollback;
+
 begin;
 alter table alterlock2
 add constraint alterlock2nv foreign key (f1) references alterlock (f1) NOT VALID;