diff --git a/tests/libtest/lib503.c b/tests/libtest/lib503.c
index a6f5d3f2c6..c77e084bcb 100644
--- a/tests/libtest/lib503.c
+++ b/tests/libtest/lib503.c
@@ -1,5 +1,11 @@
 #include "test.h"
 
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <sys/time.h>
+#include <sys/types.h>
+
 /*
  * Source code in here hugely as reported in bug report 651460 by
  * Christopher R. Palmer.
diff --git a/tests/libtest/lib504.c b/tests/libtest/lib504.c
index f6a066570f..d340c509c5 100644
--- a/tests/libtest/lib504.c
+++ b/tests/libtest/lib504.c
@@ -1,5 +1,11 @@
 #include "test.h"
 
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <sys/time.h>
+#include <sys/types.h>
+
 /*
  * Source code in here hugely as reported in bug report 651464 by
  * Christopher R. Palmer.