1 files changed, 1 insertions, 1 deletions
diff --git a/src/pool.h b/src/pool.h
index 915def16..c1325944 100644
--- a/src/pool.h
+++ b/src/pool.h
@@ -86,7 +86,7 @@ public:
 
   virtual ~commodity_pool_t() {
     TRACE_DTOR(commodity_pool_t);
-    foreach (commodities_map::value_type pair, commodities)
+    foreach (commodities_map::value_type& pair, commodities)
       checked_delete(pair.second);
   }