diff --git a/src/checks.c b/src/checks.c
index c4ac947b6..60f12264d 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -1836,6 +1836,14 @@ static int connect_proc_chk(struct task *t)
 	if (pid == 0) {
 		/* Child */
 		extern char **environ;
+		int fd;
+
+		/* close all FDs. Keep stdin/stdout/stderr in verbose mode */
+		fd = (global.mode & (MODE_QUIET|MODE_VERBOSE)) == MODE_QUIET ? 0 : 3;
+
+		while (fd < global.rlimit_nofile)
+			close(fd++);
+
 		environ = check->envp;
 		extchk_setenv(check, EXTCHK_HAPROXY_SERVER_CURCONN, ultoa_r(s->cur_sess, buf, sizeof(buf)));
 		execvp(px->check_command, check->argv);