diff --git a/bootstrap.conf b/bootstrap.conf
index ca9332da1d..d807e40543 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