diff --git a/package/iproute2/Config.in b/package/iproute2/Config.in
index b6ee86e9b8..4da0d2b1ca 100644
--- a/package/iproute2/Config.in
+++ b/package/iproute2/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_IPROUTE2
 	bool "iproute2"
+	depends on BR2_USE_MMU # fork()
 	help
 	  Kernel routing and traffic control utilities.  Provides things
 	  like ip and tc.
diff --git a/package/openswan/Config.in b/package/openswan/Config.in
index 3336156207..932a75f672 100644
--- a/package/openswan/Config.in
+++ b/package/openswan/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_OPENSWAN
 	bool "openswan"
+	depends on BR2_USE_MMU # iproute2
 	select BR2_PACKAGE_GMP
 	select BR2_PACKAGE_IPROUTE2
 	help