diff --git a/modules/lua/lua_request.c b/modules/lua/lua_request.c
index c76762a975..4622295b5f 100644
--- a/modules/lua/lua_request.c
+++ b/modules/lua/lua_request.c
@@ -504,7 +504,7 @@ static const struct luaL_Reg server_methods[] = {
 };
 
 
-static req_fun_t *makefun(void *fun, int type, apr_pool_t *pool)
+static req_fun_t *makefun(const void *fun, int type, apr_pool_t *pool)
 {
     req_fun_t *rft = apr_palloc(pool, sizeof(req_fun_t));
     rft->fun = fun;
diff --git a/modules/lua/lua_request.h b/modules/lua/lua_request.h
index 038dad0149..ad272dc98e 100644
--- a/modules/lua/lua_request.h
+++ b/modules/lua/lua_request.h
@@ -33,7 +33,7 @@ AP_LUA_DECLARE(void) ap_lua_push_request(lua_State *L, request_rec *r);
 
 typedef struct
 {
-    void *fun;
+    const void *fun;
     int type;
 } req_fun_t;