Morning! (at least where I come from)

A weird thing, while runing the following code:

sub mySub {                                             # 200
                                                        # 201
  my $file = shift;                                     # 202
  open(FILE, ">$file") or warn "Can't open $file: $!";  # 203
       # do stuff
       close(FILE);
     }

&mySub($filename);
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I got: Insecure dependency in open while runing with -T switch ....in line 203
The thing is that I don't run perl with the -T switch and I can't find out why this happened here.
anyone to the rescue?

Hotshot