diff --git a/dune/fem-dg/Makefile.am b/dune/fem-dg/Makefile.am
index d70716643a860a89b540ccd5ec05347aba413987..a080651b7daa1b650edbb5875211f84597c703fc 100644
--- a/dune/fem-dg/Makefile.am
+++ b/dune/fem-dg/Makefile.am
@@ -1,2 +1,2 @@
-SUBDIRS = operator 
+SUBDIRS = operator pass
 include $(top_srcdir)/am/global-rules