diff --git a/lib/App/Netdisco/DB/ResultSet/Device.pm b/lib/App/Netdisco/DB/ResultSet/Device.pm
index 04c4dfa1..37584d3f 100644
--- a/lib/App/Netdisco/DB/ResultSet/Device.pm
+++ b/lib/App/Netdisco/DB/ResultSet/Device.pm
@@ -442,7 +442,8 @@ Results are ordered by the Device DNS and IP fields.
 
 =item *
 
-Related rows from the C<device_vlan> table will be prefetched.
+Column C<pcount> gives a count of the number of ports on the device
+that are actually configured to carry the VLAN.
 
 =back
 
@@ -460,13 +461,16 @@ sub carrying_vlan_name {
     return $rs
       ->search_rs({}, {
         order_by => [qw/ me.dns me.ip /],
-          columns  => [
-              'me.ip',     'me.dns',
-              'me.model',  'me.os',
-              'me.vendor', 'vlans.vlan',
-              'vlans.description'
-          ],
-          join => 'vlans'
+        select => [{ count => 'ports.vlan' }],
+        as => ['pcount'],
+        columns  => [
+            'me.ip',     'me.dns',
+            'me.model',  'me.os',
+            'me.vendor', 'vlans.vlan',
+            'vlans.description'
+        ],
+        join => {'vlans' => 'ports'},
+        distinct => 1,
       })
       ->search($cond, $attrs);
 }