diff --git a/ladspa-lv2/rubberband.lv2/lv2-rubberband.ttl b/ladspa-lv2/rubberband.lv2/lv2-rubberband.ttl
index 7206877..d09d7aa 100644
--- a/ladspa-lv2/rubberband.lv2/lv2-rubberband.ttl
+++ b/ladspa-lv2/rubberband.lv2/lv2-rubberband.ttl
@@ -5,6 +5,7 @@
 @prefix foaf: <http://xmlns.com/foaf/0.1/> .
 @prefix lv2: <http://lv2plug.in/ns/lv2core#> .
 @prefix pg: <http://lv2plug.in/ns/ext/port-groups#> .
+@prefix units: <http://lv2plug.in/ns/extensions/units#> .
 @prefix rubberband: <http://breakfastquay.com/rdf/lv2-rubberband#> .
 @prefix : <#> .
 
@@ -18,7 +19,8 @@
         a lv2:ControlPort, lv2:OutputPort ;
         lv2:index 0 ;
         lv2:symbol "latency" ;
-        lv2:name "Latency" ;
+        lv2:name "latency" ;
+        units:unit units:frame ;
         lv2:designation lv2:latency ;
         lv2:portProperty lv2:integer, lv2:reportsLatency .