diff --git a/bootstrap.conf b/bootstrap.conf
index ca9332da1da1cc3f35c09981cf70021cc7f26bab..d807e405431fe8c791ea4d258f16a14a54ce1af5 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -58,6 +58,7 @@ sys_stat
 time_r
 timegm
 useless-if-before-free
+usleep
 vasprintf
 verify
 vc-list-files