diff --git a/Web/lib/MJB/Web/Controller/Auth.pm b/Web/lib/MJB/Web/Controller/Auth.pm
index f7d13ac..cadeb3f 100644
--- a/Web/lib/MJB/Web/Controller/Auth.pm
+++ b/Web/lib/MJB/Web/Controller/Auth.pm
@@ -31,6 +31,9 @@ sub do_register ( $c ) {
     push @{$c->stash->{errors}}, "Password must be at least 8 characters"
         unless length($password) >= 8;
     
+    push @{$c->stash->{errors}}, "That email address is already registered."
+        if $c->db->people( { email => $email } )->count;
+    
     return if $c->stash->{errors};
 
     my $person = try {