diff --git a/package/lesstif/Config.in b/package/lesstif/Config.in
index 3a999ead3..a6a88ec46 100644
--- a/package/lesstif/Config.in
+++ b/package/lesstif/Config.in
@@ -4,6 +4,7 @@ config BR2_PACKAGE_LESSTIF
 	select BR2_PACKAGE_XLIB_LIBXT
 	select BR2_PACKAGE_XLIB_LIBXEXT
 	select BR2_PACKAGE_FREETYPE
+	depends on BR2_USE_MMU # fork()
 	help
 	  lesstif is the Hungry Programmers' version of OSF/Motif