diff --git a/test/py.twisted/Makefile.am b/test/py.twisted/Makefile.am
index bd0cdb1..6461d12 100644
--- a/test/py.twisted/Makefile.am
+++ b/test/py.twisted/Makefile.am
@@ -32,6 +32,9 @@
 	find . -type d \( -iname "__pycache__" -or -iname "_trial_temp" \) | xargs rm -rf
 	$(RM) -r gen-py*/
 
+distdir:
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
 dist-hook:
 	find $(distdir) -type f \( -iname "*.pyc" \) | xargs rm -f
 	find $(distdir) -type d \( -iname "__pycache__" -or -iname "_trial_temp" \) | xargs rm -rf