diff --git a/package/vpnc/Config.in b/package/vpnc/Config.in
index 9abc0c5f50..bc27331c6f 100644
--- a/package/vpnc/Config.in
+++ b/package/vpnc/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_VPNC
 	bool "vpnc"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_LIBGCRYPT
 	select BR2_PACKAGE_LIBGPG_ERROR
 	help