diff --git a/libs/pbd/stateful_diff_command.cc b/libs/pbd/stateful_diff_command.cc
index 6e39e16d75..1ae70294e4 100644
--- a/libs/pbd/stateful_diff_command.cc
+++ b/libs/pbd/stateful_diff_command.cc
@@ -59,7 +59,7 @@ StatefulDiffCommand::StatefulDiffCommand (std::shared_ptr<StatefulDestructible>
 		}
 	}
 
-	assert (_changes != 0);
+	assert (_changes);
 
 	/* if the stateful object that this command refers to goes away,
            be sure to notify owners of this command.