diff --git a/tutorial/php/Makefile.am b/tutorial/php/Makefile.am
index 3d30ad9..1d11e05 100644
--- a/tutorial/php/Makefile.am
+++ b/tutorial/php/Makefile.am
@@ -31,6 +31,9 @@
 clean-local:
 	$(RM) -r gen-*
 
+distdir:
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
 EXTRA_DIST = \
 	PhpServer.php \
 	PhpClient.php \