diff --git a/package/rt-tests/Config.in b/package/rt-tests/Config.in
index 34669b243..db5e0a04e 100644
--- a/package/rt-tests/Config.in
+++ b/package/rt-tests/Config.in
@@ -1,6 +1,7 @@
 config BR2_PACKAGE_RT_TESTS
 	bool "rt-tests"
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU # fork()
 	help
 	  Set of utilities for testing the real-time behaviour of a
 	  Linux system.
@@ -27,3 +28,4 @@ comment "rt-tests may not work on MIPS with an external uClibc toolchain"
 
 comment "rt-tests needs a toolchain w/ threads"
 	depends on !BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_USE_MMU