diff --git a/src/unit.hpp b/src/unit.hpp
index aad6ee72d22..c30a02d1e33 100644
--- a/src/unit.hpp
+++ b/src/unit.hpp
@@ -491,8 +491,6 @@ private:
 
 	config modifications_;
 
-	friend void attack_type::set_specials_context(const map_location& loc, const map_location&, const unit& un, bool) const;
-
 	/** Hold the visibility status cache for a unit, mutable since it's a cache. */
 	mutable std::map<map_location, bool> invisibility_cache_;