diff --git a/package/xl2tp/Config.in b/package/xl2tp/Config.in
index 8f9d9b110b..7e2d2f6e97 100644
--- a/package/xl2tp/Config.in
+++ b/package/xl2tp/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_XL2TP
 	bool "xl2tp"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_LIBPCAP
 	help
 	  Layer 2 Tunnelling Protocol (RFC2661).