diff --git a/package/x11vnc/Config.in b/package/x11vnc/Config.in
index 5693754bf2..0909b9aec4 100644
--- a/package/x11vnc/Config.in
+++ b/package/x11vnc/Config.in
@@ -1,6 +1,7 @@
 config BR2_PACKAGE_X11VNC
 	bool "x11vnc"
 	depends on BR2_PACKAGE_XORG7
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_XLIB_LIBXT
 	select BR2_PACKAGE_XLIB_LIBXEXT
 	select BR2_PACKAGE_XLIB_LIBXTST