Not tested:
#!/usr/bin/perl -w
use strict;
my $dir = "/home/my/files";
chdir $dir or die "can't chdir $dir: $!";
my $i;
do { rename $_, ++$i . "-$_" or die "can't rename: $!" } for glob "*";
Will break on directories with more than 999 files. But so will your original. :)
(This is not meant to be golf, by the way. "I'm not saying I'd code it this way, but I'm not saying I wouldn't", to paraphrase $SOMEONE_SMARTER_THAN_ME (whose identity I forget.))
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