diff --git a/src/luasocket.c b/src/luasocket.c
index 96733b5..f72615a 100644
--- a/src/luasocket.c
+++ b/src/luasocket.c
@@ -1660,7 +1660,7 @@ static int receive_word(lua_State *L, p_sock sock)
 * Initializes the library interface with Lua and the socket library.
 * Defines the symbols exported to Lua.
 \*-------------------------------------------------------------------------*/
-void lua_socketlibopen(lua_State *L)
+LUASOCKET_API void lua_socketlibopen(lua_State *L)
 {
     struct luaL_reg funcs[] = {
         {"bind", global_tcpbind},
diff --git a/src/luasocket.h b/src/luasocket.h
index 4402c02..a580b2c 100644
--- a/src/luasocket.h
+++ b/src/luasocket.h
@@ -20,10 +20,17 @@
 #define LUASOCKET_UDPBUFFERSIZE 4096
 /* note that 576 bytes is the maximum safe value */
 
+/*-------------------------------------------------------------------------*\
+* This macro prefixes all exported API functions
+\*-------------------------------------------------------------------------*/
+#ifndef LUASOCKET_API
+#define LUASOCKET_API extern
+#endif
+
 /*-------------------------------------------------------------------------*\
 * Initializes the library interface with Lua and the socket library.
 * Defines the symbols exported to Lua.
 \*-------------------------------------------------------------------------*/
-void lua_socketlibopen(lua_State *L);
+LUASOCKET_API void lua_socketlibopen(lua_State *L);
 
 #endif /* _LUASOCKET_H_ */