diff --git a/client/mysqltest.cc b/client/mysqltest.cc
index a1835fda01b..13802781b43 100644
--- a/client/mysqltest.cc
+++ b/client/mysqltest.cc
@@ -10845,7 +10845,7 @@ void append_stmt_result(DYNAMIC_STRING *ds, MYSQL_STMT *stmt,
   my_bind= (MYSQL_BIND*) my_malloc(PSI_NOT_INSTRUMENTED, num_fields * sizeof(MYSQL_BIND),
                                    MYF(MY_WME|MY_FAE|MY_ZEROFILL));
   length= (ulong*) my_malloc(PSI_NOT_INSTRUMENTED, num_fields * sizeof(ulong),
-                             MYF(MY_WME|MY_FAE));
+                             MYF(MY_WME|MY_FAE|MY_ZEROFILL));
   is_null= (my_bool*) my_malloc(PSI_NOT_INSTRUMENTED, num_fields * sizeof(my_bool),
                                 MYF(MY_WME|MY_FAE));