diff --git a/src/blua/ldebug.c b/src/blua/ldebug.c
index 143d5d614..1eef598d1 100644
--- a/src/blua/ldebug.c
+++ b/src/blua/ldebug.c
@@ -84,7 +84,7 @@ LUA_API int lua_gethookcount (lua_State *L) {
 }
 
 
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
+__attribute__((used)) LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
   int status;
   CallInfo *ci;
   lua_lock(L);
diff --git a/src/blua/lua.h b/src/blua/lua.h
index 4e26c2a79..88787c914 100644
--- a/src/blua/lua.h
+++ b/src/blua/lua.h
@@ -331,7 +331,7 @@ typedef struct lua_Debug lua_Debug;  /* activation record */
 typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
 
 
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar);
+__attribute__((used)) LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar);
 LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
 LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
 LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);