diff --git a/gtk2_ardour/time_axis_view_item.cc b/gtk2_ardour/time_axis_view_item.cc
index f8df2e7de0..676f92cdcb 100644
--- a/gtk2_ardour/time_axis_view_item.cc
+++ b/gtk2_ardour/time_axis_view_item.cc
@@ -328,7 +328,9 @@ bool
 TimeAxisViewItem::set_duration (framecnt_t dur, void* src)
 {
 	if ((dur > max_item_duration) || (dur < min_item_duration)) {
-		warning << string_compose (_("new duration %1 frames is out of bounds for %2"), get_item_name(), dur)
+		warning << string_compose (
+				P_("new duration %1 frame is out of bounds for %2", "new duration %1 frames is out of bounds for %2", dur),
+				get_item_name(), dur)
 			<< endmsg;
 		return false;
 	}