diff --git a/src/cpu/o3/lsq_unit.hh b/src/cpu/o3/lsq_unit.hh
index 2076d67d10..693bee82c5 100644
--- a/src/cpu/o3/lsq_unit.hh
+++ b/src/cpu/o3/lsq_unit.hh
@@ -38,6 +38,7 @@
 #include <queue>
 
 #include "arch/faults.hh"
+#include "arch/isa_traits.hh"
 #include "arch/locked_mem.hh"
 #include "arch/mmapped_ipr.hh"
 #include "base/fast_alloc.hh"