diff --git a/src/writeout.c b/src/writeout.c
index 343e96ffcb..bf7393799a 100644
--- a/src/writeout.c
+++ b/src/writeout.c
@@ -26,6 +26,9 @@
 #include <stdio.h>
 #include <string.h>
 
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif