diff --git a/contrib/epee/include/net/enums.h b/contrib/epee/include/net/enums.h
index 2f27d07f9..f0c84d12e 100644
--- a/contrib/epee/include/net/enums.h
+++ b/contrib/epee/include/net/enums.h
@@ -63,3 +63,13 @@ namespace net_utils
 } // net_utils
 } // epee
 
+namespace std
+{
+	template<> struct hash<epee::net_utils::zone>
+	{
+		std::size_t operator()(const epee::net_utils::zone _z) const
+		{
+			return static_cast<std::size_t>(_z);
+		}
+	};
+} // std