diff --git a/package/mtr/Config.in b/package/mtr/Config.in
index 5e2d5b238c..ec83e25cb1 100644
--- a/package/mtr/Config.in
+++ b/package/mtr/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_MTR
 	bool "mtr"
+	depends on BR2_USE_MMU # fork()
 	help
 	  mtr combines the functionality of the 'traceroute' and 'ping'
 	  programs in a single network diagnostic tool.