diff --git a/alberta/src/alberta_Nd/Makefile.am b/alberta/src/alberta_Nd/Makefile.am
index 0b697035d1ae1ca25c68e194f311a70a9a7faa6a..94adf1ba33f2630ee6541236ae43a8bde7c459ce 100644
--- a/alberta/src/alberta_Nd/Makefile.am
+++ b/alberta/src/alberta_Nd/Makefile.am
@@ -37,5 +37,8 @@ $(srcdir)/Makefile-9d.am: \
 	cd $(top_srcdir) && sh generate-alberta-automakefiles.sh
 endif
 
+distclean-local:
+	-rm -f $(BUILT_SOURCES)
+
 all-local:
 	make -C ../Common all-local