diff --git a/util/m5/src/commands.cc b/util/m5/src/commands.cc
index 9c103fbbd5..d721899d2e 100644
--- a/util/m5/src/commands.cc
+++ b/util/m5/src/commands.cc
@@ -34,6 +34,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <iostream>
 
 #include "args.hh"
 #include "commands.hh"