diff --git a/examples/calendar/main.cpp b/examples/calendar/main.cpp
index 1b33e56..443bcbd 100644
--- a/examples/calendar/main.cpp
+++ b/examples/calendar/main.cpp
@@ -102,12 +102,16 @@ System.print("You have %(cale.appointment_count()) appointment(s)")
 		char* load_module_fn(wren::VM* vm, std::string_view module_name) {
 			if (module_name == "calendar") {
 				constexpr const std::size_t buff_sz = sizeof(g_calendar_src);
-				char* const buff = static_cast<char*>(MyConf::reallocate_fn(nullptr, buff_sz));
+				char* const buff = new char[buff_sz];
 				std::copy(g_calendar_src, g_calendar_src + buff_sz / sizeof(g_calendar_src[0]), buff);
 				return buff;
 			}
 			return nullptr;
 		}
+
+		void load_module_complete_fn(wren::VM*, std::string_view, char* buffer) {
+			delete[] buffer;
+		}
 	};
 } //unnamed namespace
 
diff --git a/examples/math_vector/main.cpp b/examples/math_vector/main.cpp
index a7e187b..5b975e4 100644
--- a/examples/math_vector/main.cpp
+++ b/examples/math_vector/main.cpp
@@ -81,9 +81,10 @@ System.print("vec3 modified by scripting: <%(vec3.x), %(vec3.y), %(vec3.z)>")
 	public:
 		char* load_module_fn(wren::VM* vm, std::string_view module_name) {
 			if (module_name == "math_vector") {
-				constexpr const std::size_t buff_sz = g_math_vector_src.size();
+				constexpr const std::size_t buff_sz = g_math_vector_src.size() + 1;
 				char* const buff = static_cast<char*>(MyConf::reallocate_fn(nullptr, buff_sz));
 				std::copy(g_math_vector_src.cbegin(), g_math_vector_src.cend(), buff);
+				buff[buff_sz - 1] = '\0';
 				return buff;
 			}
 			return nullptr;
diff --git a/include/wrenpp/vm.hpp b/include/wrenpp/vm.hpp
index db27206..72a9968 100644
--- a/include/wrenpp/vm.hpp
+++ b/include/wrenpp/vm.hpp
@@ -51,7 +51,7 @@ namespace wren {
 			char* (*load_module_fn)(Configuration&, VM*, wren_string_t) {nullptr};
 			foreign_method_t (*foreign_method_fn)(Configuration&, VM*, wren_string_t, wren_string_t, bool, wren_string_t) {nullptr};
 			foreign_class_t (*foreign_class_fn)(Configuration&, VM*, wren_string_t, wren_string_t) {nullptr};
-			void (*load_module_complete_fn)(Configuration&, VM*, wren_string_t);
+			void (*load_module_complete_fn)(Configuration&, VM*, wren_string_t, char*) {nullptr};
 
 			Configuration* config_obj {nullptr};
 			VM* owner {nullptr};
@@ -130,6 +130,7 @@ namespace wren {
 		define_method_info(load_module_fn, load_module, char*, VM*, wren_string_t);
 		define_method_info(foreign_method_fn, foreign_method, foreign_method_t, VM*, wren_string_t, wren_string_t, bool, wren_string_t);
 		define_method_info(foreign_class_fn, foreign_class, foreign_class_t, VM*, wren_string_t, wren_string_t);
+		define_method_info(load_module_complete_fn, load_module_complete, void, VM*, wren_string_t, char*);
 
 		template <typename T, typename F> struct AnyFunctionWrap;
 		template <typename T, typename R, typename... Args>
@@ -185,6 +186,9 @@ namespace wren {
 		if constexpr (detail::method_foreign_class::exists<T>::value)
 			ret.foreign_class_fn = &detail::AnyFunctionWrap<T, decltype(&T::foreign_class_fn)>::template call<&T::foreign_class_fn>;
 
+		if constexpr (detail::method_load_module_complete::exists<T>::value)
+			ret.load_module_complete_fn = &detail::AnyFunctionWrap<T, decltype(&T::load_module_complete_fn)>::template call<&T::load_module_complete_fn>;
+
 		return ret;
 	}
 
diff --git a/src/def_configuration.cpp b/src/def_configuration.cpp
index 2763549..9c03a5c 100644
--- a/src/def_configuration.cpp
+++ b/src/def_configuration.cpp
@@ -21,6 +21,7 @@
 #include "wrenpp/vm.hpp"
 #include <iostream>
 #include <algorithm>
+#include <cstdlib>
 
 namespace wren {
 	namespace {
@@ -48,25 +49,12 @@ namespace wren {
 	}
 
 	void* DefConfiguration::reallocate_fn (void* ptr, std::size_t size) {
-		if (ptr and size) {
-			//reallocate
-			char* const old_mem = static_cast<char*>(ptr);
-			char* const new_mem = new char[size];
-			std::copy(old_mem, old_mem + size, new_mem);
-			delete[] old_mem;
-			return new_mem;
+		if (0 == size) {
+			std::free(ptr);
+			return nullptr;
 		}
-		else if (ptr and not size) {
-			//free
-			char* const old_mem = static_cast<char*>(ptr);
-			delete[] old_mem;
-		}
-		else if (not ptr and size) {
-			//allocate
-			char* const new_mem = new char[size];
-			return new_mem;
-		}
-		return nullptr;
+
+		return std::realloc(ptr, size);
 	}
 
 	foreign_method_t DefConfiguration::foreign_method_fn (VM* vm, wren_string_t module_name, wren_string_t class_name, bool is_static, wren_string_t signature) {
diff --git a/src/vm.cpp b/src/vm.cpp
index ecc1d1b..dff58c8 100644
--- a/src/vm.cpp
+++ b/src/vm.cpp
@@ -77,7 +77,7 @@ namespace wren {
 			return ::WrenLoadModuleResult{
 				.source = source,
 				.onComplete = (cb->load_module_complete_fn ? &load_module_complete_fn : nullptr),
-				.userData = user_data
+				.userData = nullptr
 			};
 		}
 
@@ -102,7 +102,11 @@ namespace wren {
 			assert(cb);
 			assert(cb->load_module_complete_fn and cb->config_obj and cb->owner);
 
-			(*cb->load_module_complete_fn)(*cb->config_obj, cb->owner, name);
+			//Documentation says result is the same object we returned from
+			//load_module_fn. It should then be safe to const_cast source,
+			//since it wasn't const when we got it there
+			char* const non_const_buff = const_cast<char*>(result.source);
+			(*cb->load_module_complete_fn)(*cb->config_obj, cb->owner, name, non_const_buff);
 		}
 
 		WrenForeignClassMethods foreign_class_fn (WrenVM* wvm, const char* module, const char* class_name) {