diff --git a/package/synergy/Config.in b/package/synergy/Config.in
index 20a3a9a592..6b64b79e34 100644
--- a/package/synergy/Config.in
+++ b/package/synergy/Config.in
@@ -3,6 +3,7 @@ config BR2_PACKAGE_SYNERGY
 	depends on BR2_PACKAGE_XORG7
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_USE_WCHAR
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_XLIB_LIBXTST
 	help
 	  Synergy lets you easily share a single mouse and
@@ -14,4 +15,5 @@ config BR2_PACKAGE_SYNERGY
 
 comment "synergy needs a toolchain w/ C++, wchar"
 	depends on BR2_PACKAGE_XORG7
+	depends on BR2_USE_MMU
 	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_USE_WCHAR)