diff --git a/include/wrenpp/vm.hpp b/include/wrenpp/vm.hpp
index f239a0a..501a9b6 100644
--- a/include/wrenpp/vm.hpp
+++ b/include/wrenpp/vm.hpp
@@ -45,12 +45,13 @@ namespace wren {
 
 	class VM {
 	public:
-		template <typename T>
-		VM (T* conf);
+		template <typename T> VM (T* conf);
 		VM (const VM&) = delete;
 		VM (VM&& other) = default;
 		~VM() noexcept;
 
+		VM& operator= (VM&&) = default;
+
 		void interpret (const char* module_name, const char* script);
 		void call (const Handle& method);
 		void release_handle (Handle& handle) noexcept;