diff --git a/mainloop.c b/mainloop.c
index 28358c5f..eca89190 100644
--- a/mainloop.c
+++ b/mainloop.c
@@ -219,7 +219,7 @@ int openconnect_mainloop(struct openconnect_info *vpninfo,
 
 	cstp_bye(vpninfo, vpninfo->quit_reason);
 
-	shutdown_tun(vpninfo);
+	os_shutdown_tun(vpninfo);
 	return ret < 0 ? ret : -EIO;
 }
 
diff --git a/openconnect-internal.h b/openconnect-internal.h
index dffba1be..6a1ff579 100644
--- a/openconnect-internal.h
+++ b/openconnect-internal.h
@@ -454,7 +454,7 @@ void set_script_env(struct openconnect_info *vpninfo);
 int script_config_tun(struct openconnect_info *vpninfo, const char *reason);
 
 /* tun.c */
-void shutdown_tun(struct openconnect_info *vpninfo);
+void os_shutdown_tun(struct openconnect_info *vpninfo);
 int os_read_tun(struct openconnect_info *vpninfo, struct pkt *pkt, int new_pkt);
 int os_write_tun(struct openconnect_info *vpninfo, struct pkt *pkt);
 
diff --git a/tun-win32.c b/tun-win32.c
index 1f212428..a4f8bb79 100644
--- a/tun-win32.c
+++ b/tun-win32.c
@@ -264,3 +264,12 @@ int os_write_tun(struct openconnect_info *vpninfo, struct pkt *pkt)
 		     _("Failed to write to TAP device: %lx\n"), err);
 	return -1;
 }
+
+void os_shutdown_tun(struct openconnect_info *vpninfo)
+{
+	script_config_tun(vpninfo, "disconnect");
+	CloseHandle(vpninfo->tun_fh);
+	vpninfo->tun_fh = NULL;
+	CloseHandle(vpninfo->tun_rd_overlap.hEvent);
+	vpninfo->tun_rd_overlap.hEvent = NULL;
+}
diff --git a/tun.c b/tun.c
index b5208e0d..a5ab1a0b 100644
--- a/tun.c
+++ b/tun.c
@@ -467,15 +467,9 @@ int openconnect_setup_tun_device(struct openconnect_info *vpninfo, char *vpnc_sc
 	return openconnect_setup_tun_fd(vpninfo, tun_fd);
 }
 
-void shutdown_tun(struct openconnect_info *vpninfo)
+#ifndef _WIN32
+void os_shutdown_tun(struct openconnect_info *vpninfo)
 {
-#ifdef _WIN32
-	script_config_tun(vpninfo, "disconnect");
-	CloseHandle(vpninfo->tun_fh);
-	vpninfo->tun_fh = NULL;
-	CloseHandle(vpninfo->tun_rd_overlap.hEvent);
-	vpninfo->tun_rd_overlap.hEvent = NULL;
-#else
 	if (vpninfo->script_tun) {
 		/* nuke the whole process group */
 		kill(-vpninfo->script_tun, SIGHUP);
@@ -494,5 +488,5 @@ void shutdown_tun(struct openconnect_info *vpninfo)
 	if (vpninfo->vpnc_script)
 		close(vpninfo->tun_fd);
 	vpninfo->tun_fd = -1;
-#endif
 }
+#endif