diff --git a/package/matchbox/Config.in b/package/matchbox/Config.in
index da02df3f8a..b70133e4d5 100644
--- a/package/matchbox/Config.in
+++ b/package/matchbox/Config.in
@@ -1,6 +1,7 @@
 config BR2_PACKAGE_MATCHBOX
 	bool "MatchBox Window Manager"
 	depends on BR2_PACKAGE_XORG7
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_FONTCONFIG
 	select BR2_PACKAGE_EXPAT
 	select BR2_PACKAGE_XLIB_LIBXEXT