diff --git a/src/cpu/o3/commit_impl.hh b/src/cpu/o3/commit_impl.hh
index 6ac946ac1..776968f8c 100644
--- a/src/cpu/o3/commit_impl.hh
+++ b/src/cpu/o3/commit_impl.hh
@@ -42,6 +42,7 @@
  */
 
 #include <algorithm>
+#include <set>
 #include <string>
 
 #include "arch/utility.hh"