diff --git a/src/cpu/simple/atomic.hh b/src/cpu/simple/atomic.hh
index 5a9275a773..7366213f86 100644
--- a/src/cpu/simple/atomic.hh
+++ b/src/cpu/simple/atomic.hh
@@ -58,7 +58,7 @@ typedef std::pair<Addr, Addr> BasicBlockRange;
 /** Overload hash function for BasicBlockRange type */
 __hash_namespace_begin
 template <>
-class hash<BasicBlockRange>
+struct hash<BasicBlockRange>
 {
   public:
     size_t operator()(const BasicBlockRange &bb) const {