diff --git a/lib/timeval.h b/lib/timeval.h
index effd741da..6c55a71ba 100644
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -30,6 +30,9 @@
 
 #include "setup.h"
 
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #ifdef TIME_WITH_SYS_TIME