diff --git a/client/mysql_upgrade.c b/client/mysql_upgrade.c
index 0ac2c8b5853..d35591cd71c 100644
--- a/client/mysql_upgrade.c
+++ b/client/mysql_upgrade.c
@@ -70,7 +70,7 @@ static char **defaults_argv;
 
 static my_bool not_used; /* Can't use GET_BOOL without a value pointer */
 
-char upgrade_from_version[sizeof("10.20.456-MariaDB")+1];
+char upgrade_from_version[1024];
 
 static my_bool opt_write_binlog;