diff --git a/package/fan-ctrl/Config.in b/package/fan-ctrl/Config.in
index 392904c9f9..869631683b 100644
--- a/package/fan-ctrl/Config.in
+++ b/package/fan-ctrl/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_FAN_CTRL
 	bool "fan-ctrl"
+	depends on BR2_USE_MMU # fork()
 	help
 	  Fan-ctrl is a little daemon that controls the speed of one
 	  or more system or CPU fans. It does so by monitoring