diff --git a/README.md b/README.md
index 7b7e538..1179bdf 100644
--- a/README.md
+++ b/README.md
@@ -50,5 +50,4 @@ Add the `-v` option for more verbose output
 ## TODOs
 
 1. Input validation
-1. Filter URLs out of message body
 1. Set date in the DB rather than the model
diff --git a/cpanfile b/cpanfile
index d663315..eef7a1a 100644
--- a/cpanfile
+++ b/cpanfile
@@ -5,3 +5,4 @@ requires 'Mojolicious::Lite';
 requires 'Mojo::Pg';
 requires 'Mojolicious::Plugin::TagHelpers::Pagination';
 requires 'Mojolicious::Plugin::AssetPack';
+requires 'Regexp::Common::URI';
diff --git a/guestbook-ng.pl b/guestbook-ng.pl
index 6dca81a..0373853 100755
--- a/guestbook-ng.pl
+++ b/guestbook-ng.pl
@@ -6,6 +6,7 @@
 use Mojolicious::Lite -signatures;
 use Mojo::Pg;
 use List::Util qw{shuffle};
+use Regexp::Common qw{URI};
 use Data::Dumper; # Uncomment for debugging
 
 # Load the model
@@ -69,6 +70,10 @@ any [qw{GET POST}], '/sign' => sub ($c) {
         my $message = $c->param('message');
         my $spam    = $c->param('answer') ? 0 : 1;
 
+        # No URLs in message body since they have their own field
+        $spam =
+            $message =~ /$RE{URI}{HTTP}{-scheme => qr<https?>}/ ? 1 : 0;
+
         if ($message) {
             $c->message->create_post($name, $message, $url, $spam);
             $c->redirect_to('index');