diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 988ab7e67e..2a413b5f39 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -33,6 +33,7 @@ our $Options = {
         label   => 'Output filename format',
         cli     => 'output-filename-format=s',
         type    => 's',
+        width   => 300,
     },
 
     # printer options
diff --git a/lib/Slic3r/GUI/OptionsGroup.pm b/lib/Slic3r/GUI/OptionsGroup.pm
index 97c6ffee85..a2398e8df6 100644
--- a/lib/Slic3r/GUI/OptionsGroup.pm
+++ b/lib/Slic3r/GUI/OptionsGroup.pm
@@ -42,12 +42,8 @@ sub new {
         my $field;
         if ($opt->{type} =~ /^(i|f|s|s@)$/) {
             my $style = 0;
-            my $size = Wx::wxDefaultSize;
-            
-            if ($opt->{multiline}) {
-                $style = &Wx::wxTE_MULTILINE;
-                $size = Wx::Size->new($opt->{width} || -1, $opt->{height} || -1);
-            }
+            $style = &Wx::wxTE_MULTILINE if $opt->{multiline};
+            my $size = Wx::Size->new($opt->{width} || -1, $opt->{height} || -1);
             
             my ($get, $set) = $opt->{type} eq 's@' ? qw(serialize deserialize) : qw(get set);