diff --git a/libgloss/i386/cygmon-gmon.c b/libgloss/i386/cygmon-gmon.c
index 3c15b70d3..ac3af30a6 100644
--- a/libgloss/i386/cygmon-gmon.c
+++ b/libgloss/i386/cygmon-gmon.c
@@ -62,6 +62,10 @@ static char sccsid[] = "@(#)gmon.c	5.3 (Berkeley) 5/22/91";
 #include <stdio.h>
 #endif
 
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
 #include "cygmon-gmon.h"
 
 /*