diff --git a/src/item_pocket.h b/src/item_pocket.h
index 054fc9dc6f5f1..afb4002ed9a06 100644
--- a/src/item_pocket.h
+++ b/src/item_pocket.h
@@ -91,7 +91,7 @@ class item_pocket
         bool will_explode_in_a_fire() const;
         bool detonate( const tripoint &p, std::vector<item> &drops );
         bool process( const itype &type, player *carrier, const tripoint &pos, bool activate,
-                      float insulation, const temperature_flag flag );
+                      float insulation, temperature_flag flag );
         bool legacy_unload( player *guy, bool &changed );
         void remove_all_ammo( Character &guy );
         void remove_all_mods( Character &guy );