diff --git a/package/siproxd/Config.in b/package/siproxd/Config.in
index e73a33bf14..24c710b375 100644
--- a/package/siproxd/Config.in
+++ b/package/siproxd/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_SIPROXD
 	bool "siproxd"
+	depends on BR2_USE_MMU # fork()
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBOSIP2
 	select BR2_PACKAGE_LIBTOOL
@@ -18,4 +19,5 @@ config BR2_PACKAGE_SIPROXD
 	  http://siproxd.sourceforge.net/
 
 comment "siproxd needs a toolchain w/ threads"
+	depends on BR2_USE_MMU
 	depends on !BR2_TOOLCHAIN_HAS_THREADS