diff --git a/app/dexter.pl b/app/dexter.pl
index 479a041..0198af5 100755
--- a/app/dexter.pl
+++ b/app/dexter.pl
@@ -32,7 +32,10 @@ Readonly::Hash my %MEANING_OF_HTTP_CODE => (
 
 Readonly my $ROOT_DIRECTORY   => 'public';
 Readonly my $SOCKET_DIRECTORY => '/var/www/run';
-Readonly my $MAX_REQUEST_SIZE => 100 * $MEGABYTE;
+Readonly my $TEMP_DIRECTORY   => '/tmp/dexter';
+Readonly my $MAX_REQUEST_SIZE => $GIGABYTE;
+
+mkdir $TEMP_DIRECTORY;
 
 Readonly::Hash my %PERMISSIONS => (
     NONE   => 0,
@@ -584,7 +587,7 @@ if ( module_installed('OpenBSD::Unveil') ) {
         unveil($directory, 'r');
     }
 
-    unveil($ENV{TMPDIR}, 'rw');
+    unveil($TEMP_DIRECTORY, 'rw');
     unveil('/dev/null',  'rw');
 
     my ( undef, $parent_directory, undef ) = File::Spec->splitpath($0);