diff --git a/package/dtach/Config.in b/package/dtach/Config.in
index 033536bdb..bea112b36 100644
--- a/package/dtach/Config.in
+++ b/package/dtach/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_DTACH
 	bool "dtach"
+	depends on BR2_USE_MMU # fork()
 	help
 	  dtach is a tiny program that emulates the detach feature of screen,
 	  allowing you to run a program in an environment that is protected