diff --git a/doc/configuration.txt b/doc/configuration.txt
index b22ac98..dde0c54 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -3583,7 +3583,7 @@
   Remember that this does not check database presence nor database consistency.
   To do this, you can use an external check with xinetd for example.
 
-  The check requires MySQL >=4.0, for older version, please use TCP check.
+  The check requires MySQL >=3.22, for older version, please use TCP check.
 
   Most often, an incoming MySQL server needs to see the client's IP address for
   various purposes, including IP privilege matching and connection logging.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 7a572fb..2a08594 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3476,6 +3476,7 @@
 							((unsigned char) (packetlen >> 16) & 0xff));
 
 						curproxy->check_req[3] = 1;
+						curproxy->check_req[5] = 128;
 						curproxy->check_req[8] = 1;
 						memcpy(&curproxy->check_req[9], mysqluser, userlen);
 						curproxy->check_req[9 + userlen + 1 + 1]     = 1;