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
