diff --git a/mysql-test/t/replace.test b/mysql-test/t/replace.test
index 4000ee1b4e2..2d59b26a525 100644
--- a/mysql-test/t/replace.test
+++ b/mysql-test/t/replace.test
@@ -10,6 +10,7 @@ CREATE TABLE t1 (
   PRIMARY KEY (gesuchnr,benutzer_id)
 ) type=ISAM;
 
+replace into t1 (gesuchnr,benutzer_id) values (2,1);
 replace into t1 (gesuchnr,benutzer_id) values (1,1);
 replace into t1 (gesuchnr,benutzer_id) values (1,1);
 alter table t1 type=myisam;
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 13da095607d..c10e2a205b8 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -366,7 +366,8 @@ int write_record(TABLE *table,COPY_INFO *info)
 	}
 	key_copy((byte*) key,table,key_nr,0);
 	if ((error=(table->file->index_read_idx(table->record[1],key_nr,
-						(byte*) key,0,
+						(byte*) key,
+						table->key_info[key_nr].key_length,
 						HA_READ_KEY_EXACT))))
 	  goto err;
       }