diff --git a/plugins-scripts/check_mssql.pl b/plugins-scripts/check_mssql.pl
index 9a8fc51..17e6d33 100755
--- a/plugins-scripts/check_mssql.pl
+++ b/plugins-scripts/check_mssql.pl
@@ -49,7 +49,7 @@ $SIG{'ALRM'} = sub {
      print ("SQL UNKNOWN: ERROR connection $server (alarm timeout)\n");
      exit $ERRORS{"UNKNOWN"};
 };
-alarm($TIMEOUT);
+alarm($timeout);
 
 unless ($dbh = DBI->connect("dbi:Sybase:server=".uc($server), "$username", "$password")) {
 	printf "SQL CRITICAL: Can't connect to mssql server $DBI::errstr\n";