diff --git a/Makefile.in b/Makefile.in

index dc2fc59..45988b4 100644

--- a/Makefile.in

+++ b/Makefile.in

@@ -129,7 +129,7 @@ doinstall: $(SUBDIRS)

 	do \

 	    (cd $$d; $(MAKE) DESTDIR=$(DESTDIR) install); \

 	done

-	$(PYTHON) -c 'from compileall import *; compile_dir("$(DESTDIR)$(prefix)/Mailman", ddir="$(prefix)/Mailman")'

+	$(PYTHON) -c 'from compileall import *; compile_dir("$(DESTDIR)$(prefix)/Mailman", 20, "$(prefix)", 1)'

 # Only run bin/update if we aren't installing in DESTDIR, as this

 # means there are probably no lists to deal with, and it wouldn't