diff --git a/Makefile.am b/Makefile.am
index dcc09f60b4..d79775a798 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in
 
-SRC_SUBDIRS = gdk gtk
+SRC_SUBDIRS = gdk gtk themes
 SUBDIRS = $(SRC_SUBDIRS) docs
 
 bin_SCRIPTS = gtk-config