diff --git a/passes/opt/muxpack.cc b/passes/opt/muxpack.cc
index b243f594f..fe60d5404 100644
--- a/passes/opt/muxpack.cc
+++ b/passes/opt/muxpack.cc
@@ -246,7 +246,7 @@ struct MuxpackWorker
 
 	void process_chain(vector<Cell*> &chain, bool make_excl)
 	{
-		if (GetSize(chain) < 3)
+		if (GetSize(chain) < 2)
 			return;
 
 		int cursor = 0;