diff --git a/winsup/testsuite/Makefile.am b/winsup/testsuite/Makefile.am
index 4b8c7dbb7..ac68934d0 100644
--- a/winsup/testsuite/Makefile.am
+++ b/winsup/testsuite/Makefile.am
@@ -61,4 +61,6 @@ EXTRA_DEJAGNU_SITE_CONFIG = site-extra.exp
 clean-local:
 	rm -f *.log *.exe *.exp *.bak *.stackdump winsup.sum
 
+if CROSS_BOOTSTRAP
 SUBDIRS = cygrun
+endif