diff --git a/libs/surfaces/mackie/strip.cc b/libs/surfaces/mackie/strip.cc
index 5826ec3742..d355d13d63 100644
--- a/libs/surfaces/mackie/strip.cc
+++ b/libs/surfaces/mackie/strip.cc
@@ -257,6 +257,10 @@ Strip::set_route (boost::shared_ptr<Route> r, bool /*with_messages*/)
 			}
 		}
 	}
+
+	if (_route->trim()) {
+		possible_pot_parameters.push_back (TrimAutomation);
+	}
 }
 
 void