diff --git a/package/cvs/Config.in b/package/cvs/Config.in
index f9d5955f47..2308144046 100644
--- a/package/cvs/Config.in
+++ b/package/cvs/Config.in
@@ -1,6 +1,8 @@
 config BR2_PACKAGE_CVS
 	bool "cvs"
 	depends on BR2_USE_WCHAR
+	# needs fork()
+	depends on BR2_USE_MMU
 	select BR2_PACKAGE_NCURSES
 	help
 	  Concurrent Versions System - source code revision control tools.