diff --git a/sys/src/cmd/mothra/mkfile b/sys/src/cmd/mothra/mkfile
index c770188a9..a0ff8a31a 100644
--- a/sys/src/cmd/mothra/mkfile
+++ b/sys/src/cmd/mothra/mkfile
@@ -25,4 +25,4 @@ $LIB:V:
 
 clean nuke:V:
 	@{ cd libpanel; mk $target }
-	rm -f *.[$OS] [$OS].out $TARG
+	rm -f *.[$OS] [$OS].out version.c $TARG