diff --git a/package/nuttcp/Config.in b/package/nuttcp/Config.in
index fb6d3b1..eea88fd 100644
--- a/package/nuttcp/Config.in
+++ b/package/nuttcp/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_NUTTCP
 	bool "nuttcp"
+	depends on BR2_USE_MMU # fork()
 	help
 	  nuttcp is a TCP/UDP network testing tool, much like iperf