diff --git a/doc/tutorial.md b/doc/tutorial.md
index 1797a75..2cfef5a 100644
--- a/doc/tutorial.md
+++ b/doc/tutorial.md
@@ -593,7 +593,7 @@ module_func_info func_tbl[] = {
 // the reason why using this way to get function pointer
 // is because `var` has constructors, which is not compatiable in C
 // so "extern "C" var fib" may get compilation warnings
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 ```
diff --git a/doc/tutorial_zh.md b/doc/tutorial_zh.md
index f97c139..b6f7070 100644
--- a/doc/tutorial_zh.md
+++ b/doc/tutorial_zh.md
@@ -574,7 +574,7 @@ module_func_info func_tbl[] = {
 // 之所以用这种方式来获取函数指针, 是因为`var`是有构造函数的
 // 有构造函数的类型作为返回值, 和C是不兼容的, 这导致
 // 类似 "extern "C" var fib" 的写法会得到编译错误
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 ```
diff --git a/module/fib.cpp b/module/fib.cpp
index 6e22011..dcc77ee 100644
--- a/module/fib.cpp
+++ b/module/fib.cpp
@@ -115,7 +115,7 @@ module_func_info func_tbl[] = {
 
 }
 
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return fib_module::func_tbl;
 }
 
diff --git a/module/json.cpp b/module/json.cpp
index 8dab16f..ef4bf4f 100644
--- a/module/json.cpp
+++ b/module/json.cpp
@@ -371,7 +371,7 @@ module_func_info func_tbl[] = {
     {nullptr, nullptr}
 };
 
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 
diff --git a/module/keyboard.cpp b/module/keyboard.cpp
index 8586c58..27df676 100644
--- a/module/keyboard.cpp
+++ b/module/keyboard.cpp
@@ -106,7 +106,7 @@ module_func_info func_tbl[] = {
     {nullptr, nullptr}
 };
 
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 
diff --git a/module/matrix.cpp b/module/matrix.cpp
index 6dc8bb7..3108427 100644
--- a/module/matrix.cpp
+++ b/module/matrix.cpp
@@ -295,7 +295,7 @@ module_func_info func_tbl[] = {
     {nullptr, nullptr}
 };
 
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 
diff --git a/module/nasocket.cpp b/module/nasocket.cpp
index 0ddbea2..282dc2c 100644
--- a/module/nasocket.cpp
+++ b/module/nasocket.cpp
@@ -256,7 +256,7 @@ module_func_info func_tbl[] = {
     {nullptr, nullptr}
 };
 
-extern "C" module_func_info* get() {
+NASAL_EXTERN module_func_info* get() {
     return func_tbl;
 }
 
diff --git a/src/nasal_gc.h b/src/nasal_gc.h
index a1e0071..e1c9a39 100644
--- a/src/nasal_gc.h
+++ b/src/nasal_gc.h
@@ -124,4 +124,13 @@ struct module_func_info {
 // module function "get" type
 typedef module_func_info* (*get_func_ptr)();
 
+
+// avoid error loading function bug in MSVC version nasal.exe
+#ifdef _MSC_VER
+    // and fuck MSVC again
+    #define NASAL_EXTERN extern "C" __declspec(dllexport)
+#else
+    #define NASAL_EXTERN extern "C"
+#endif
+
 }