diff --git a/src/axi_mcast_demux.sv b/src/axi_mcast_demux.sv
index fe1713588..58f6529ce 100644
--- a/src/axi_mcast_demux.sv
+++ b/src/axi_mcast_demux.sv
@@ -512,6 +512,7 @@ module axi_mcast_demux #(
         // In the next cycle we are again idle
         MCastAwHandshakeInProgress:
           mcast_aw_hs_state_d = MCastAwHandshakeIdle;
+        default: ;
       endcase
     end