diff --git a/mysql-test/r/ndb_update.result b/mysql-test/r/ndb_update.result
index c2247564e65..4848284b4af 100644
--- a/mysql-test/r/ndb_update.result
+++ b/mysql-test/r/ndb_update.result
@@ -31,3 +31,11 @@ pk1	b	c
 12	2	2
 14	1	1
 DROP TABLE IF EXISTS t1;
+CREATE TABLE t1(a INT NOT NULL, UNIQUE(a)) ENGINE=ndbcluster;
+INSERT INTO t1 VALUES(1),(2);
+UPDATE IGNORE t1, t1 AS t1a SET t1.a=3;
+SELECT a FROM t1 ORDER BY a;
+a
+1
+3
+DROP TABLE t1;
diff --git a/mysql-test/t/ndb_update.test b/mysql-test/t/ndb_update.test
index 45e3add4639..e7c5fd0c4a5 100644
--- a/mysql-test/t/ndb_update.test
+++ b/mysql-test/t/ndb_update.test
@@ -33,4 +33,13 @@ select * from t1 order by pk1;
 DROP TABLE IF EXISTS t1;
 --enable_warnings
 
+#
+# BUG#21381 - Engine not notified about multi-table UPDATE IGNORE
+#
+CREATE TABLE t1(a INT NOT NULL, UNIQUE(a)) ENGINE=ndbcluster;
+INSERT INTO t1 VALUES(1),(2);
+UPDATE IGNORE t1, t1 AS t1a SET t1.a=3;
+SELECT a FROM t1 ORDER BY a;
+DROP TABLE t1;
+
 # End of 4.1 tests
diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index af4ba8025f9..6742fbad5c4 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -901,6 +901,8 @@ multi_update::initialize_tables(JOIN *join)
     List<Item> temp_fields= *fields_for_table[cnt];
     ORDER     group;
 
+    if (ignore)
+      table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
     if (table == main_table)			// First table in join
     {
       if (safe_update_on_fly(join->join_tab, &temp_fields))
@@ -1007,7 +1009,11 @@ multi_update::~multi_update()
 {
   TABLE_LIST *table;
   for (table= update_tables ; table; table= table->next)
+  {
     table->table->no_keyread= table->table->no_cache= 0;
+    if (ignore)
+      table->table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
+  }
 
   if (tmp_tables)
   {