diff --git a/modules/lua/lua_apr.c b/modules/lua/lua_apr.c
index 383115945d..ce109b1d0a 100644
--- a/modules/lua/lua_apr.c
+++ b/modules/lua/lua_apr.c
@@ -1000,7 +1000,7 @@ static int lua_ap_make_etag (lua_State *L) {
 static int lua_ap_send_interim_response (lua_State *L) {
 
     request_rec *r;
-    int send_headers;
+    int send_headers = 0;
     luaL_checktype(L, 1, LUA_TUSERDATA);
     r = ap_lua_check_request_rec(L, 1);
     if ( lua_isboolean( L, 2 ) ) send_headers =  lua_toboolean( L, 2 );