diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index a0b6abfbd277..948e3fe249ec 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -519,6 +519,9 @@ send_fragmentable:
 		}
 		break;
 #endif
+
+	default:
+		BUG();
 	}
 
 	if (ret < 0)