diff --git a/tests/torture_pki.c b/tests/torture_pki.c
index 07c01094..f7be636e 100644
--- a/tests/torture_pki.c
+++ b/tests/torture_pki.c
@@ -4,7 +4,10 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #include "torture_pki.h"