diff --git a/package/empty/Config.in b/package/empty/Config.in
index 67b09fcb3b..7fd0877cbb 100644
--- a/package/empty/Config.in
+++ b/package/empty/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_EMPTY
 	bool "empty"
+	depends on BR2_USE_MMU # uses fork()
 	help
 	  Run processes and applications under pseudo-terminal (PTY) sessions.