diff --git a/README.md b/README.md
index 28a4a14..ab04bb0 100644
--- a/README.md
+++ b/README.md
@@ -2129,9 +2129,12 @@ send async callback immidiately
 ##### *Example*
 
 
-
 ### void uv_queue_work(resource $loop, callable $callback, callable $after_callback)
 
+##### *Description*
+
+execute callbacks in another thread (requires Thread Safe enabled PHP)
+
 
 ### resource uv_fs_open(resource $loop, string $path, long $flag, long $mode, callable $callback)
 
@@ -2835,8 +2838,7 @@ $poll = uv_poll_init(uv_default_loop(), $fd);
 ##### *Note*
 
 * if you want to use a socket. please use uv_poll_init_socket instead of this. Windows can't handle socket with this function.
-
-
+* some platform doesn't support file descriptor on these method.
 
 ### uv uv_poll_init_socket([resource $uv_loop], zval fd)
 
diff --git a/php_uv.c b/php_uv.c
index 08752d7..affb113 100644
--- a/php_uv.c
+++ b/php_uv.c
@@ -169,6 +169,16 @@ zend_fcall_info empty_fcall_info = { 0, NULL, NULL, NULL, NULL, 0, NULL, NULL, 0
 #define PHP_UV_DEBUG_RESOURCE_REFCOUNT(name, resource_id)
 #endif
 
+#ifdef ZTS
+#define UV_FETCH_ALL(ls, id, type) ((type) (*((void ***) ls))[TSRM_UNSHUFFLE_RSRC_ID(id)])
+#define UV_FETCH_CTX(ls, id, type, element) (((type) (*((void ***) ls))[TSRM_UNSHUFFLE_RSRC_ID(id)])->element)
+#define UV_CG(ls, v)  UV_FETCH_CTX(ls, compiler_globals_id, zend_compiler_globals*, v)
+#define UV_CG_ALL(ls) UV_FETCH_ALL(ls, compiler_globals_id, zend_compiler_globals*)
+#define UV_EG(ls, v)  UV_FETCH_CTX(ls, executor_globals_id, zend_executor_globals*, v)
+#define UV_SG(ls, v)  UV_FETCH_CTX(ls, sapi_globals_id, sapi_globals_struct*, v)
+#define UV_EG_ALL(ls) UV_FETCH_ALL(ls, executor_globals_id, zend_executor_globals*)
+#endif
+
 
 extern void php_uv_init(TSRMLS_D);
 
@@ -1198,15 +1208,6 @@ static int php_uv_do_callback(zval **retval_ptr, zval *callback, zval ***params,
 	return error;
 }
 
-
-#define UV_FETCH_ALL(ls, id, type) ((type) (*((void ***) ls))[TSRM_UNSHUFFLE_RSRC_ID(id)])
-#define UV_FETCH_CTX(ls, id, type, element) (((type) (*((void ***) ls))[TSRM_UNSHUFFLE_RSRC_ID(id)])->element)
-#define UV_CG(ls, v)  UV_FETCH_CTX(ls, compiler_globals_id, zend_compiler_globals*, v)
-#define UV_CG_ALL(ls) UV_FETCH_ALL(ls, compiler_globals_id, zend_compiler_globals*)
-#define UV_EG(ls, v)  UV_FETCH_CTX(ls, executor_globals_id, zend_executor_globals*, v)
-#define UV_SG(ls, v)  UV_FETCH_CTX(ls, sapi_globals_id, sapi_globals_struct*, v)
-#define UV_EG_ALL(ls) UV_FETCH_ALL(ls, executor_globals_id, zend_executor_globals*)
-
 static int php_uv_do_callback2(zval **retval_ptr, php_uv_t *uv, zval ***params, int param_count, enum php_uv_callback_type type TSRMLS_DC)
 {
 	int error = 0;
@@ -1229,6 +1230,7 @@ static int php_uv_do_callback2(zval **retval_ptr, php_uv_t *uv, zval ***params,
 	return error;
 }
 
+#ifdef ZTS
 static int php_uv_do_callback3(zval **retval_ptr, php_uv_t *uv, zval ***params, int param_count, enum php_uv_callback_type type)
 {
 	int error = 0;
@@ -1288,6 +1290,11 @@ static int php_uv_do_callback3(zval **retval_ptr, php_uv_t *uv, zval ***params,
 
 	return error;
 }
+#else
+static int php_uv_do_callback3(zval **retval_ptr, php_uv_t *uv, zval ***params, int param_count, enum php_uv_callback_type type)
+{
+}
+#endif
 
 static void php_uv_tcp_connect_cb(uv_connect_t *req, int status)
 {
@@ -5604,6 +5611,7 @@ PHP_FUNCTION(uv_async_send)
 */
 PHP_FUNCTION(uv_queue_work)
 {
+#ifdef ZTS
 	int r;
 	zval *zloop = NULL;
 	uv_loop_t *loop;
@@ -5631,6 +5639,9 @@ PHP_FUNCTION(uv_queue_work)
 		php_error_docref(NULL TSRMLS_CC, E_ERROR, "uv_queue_work failed");
 		return;
 	}
+#else
+	php_error_docref(NULL TSRMLS_CC, E_ERROR, "uv_queue_work doesn't support this PHP. please rebuild with --enable-maintainer-zts");
+#endif
 }
 /* }}} */
 
diff --git a/tests/800-uv_queue_work.phpt b/tests/800-uv_queue_work.phpt
index 5c072c6..7255d39 100644
--- a/tests/800-uv_queue_work.phpt
+++ b/tests/800-uv_queue_work.phpt
@@ -1,5 +1,13 @@
 --TEST--
 Check for uv_queue_work
+--SKIPIF--
+<?php
+ob_start();
+phpinfo();
+$data = ob_get_clean();
+if (!preg_match("/Thread Safety.+?enabled/", $data)) {
+  echo "skip";
+}
 --FILE--
 <?php
 $loop = uv_default_loop();