diff --git a/tests/001-constants.phpt b/tests/001-constants.phpt
index 2b151b0..22ffaec 100644
--- a/tests/001-constants.phpt
+++ b/tests/001-constants.phpt
@@ -39,6 +39,12 @@ if (!defined("UV::S_IRWXU")) {
 if (!defined("UV::S_IRUSR")) {
   echo "FAILED UV::S_IRUSR" . PHP_EOL;
 }
+if (!defined("UV::S_IWUSR")) {
+  echo "FAILED UV::S_IWUSR" . PHP_EOL;
+}
+if (!defined("UV::S_IXUSR")) {
+  echo "FAILED UV::S_IXUSR" . PHP_EOL;
+}
 if (!defined("UV::S_IRWXG")) {
   echo "FAILED UV::S_IRWXG" . PHP_EOL;
 }
diff --git a/uv.c b/uv.c
index 2bd3111..c13a321 100644
--- a/uv.c
+++ b/uv.c
@@ -52,6 +52,8 @@ static int php_uv_class_init(TSRMLS_D)
 
 	zend_declare_class_constant_long(uv_class_entry, "S_IRWXU",  sizeof("S_IRWXU")-1, S_IRWXU TSRMLS_CC);
 	zend_declare_class_constant_long(uv_class_entry, "S_IRUSR",  sizeof("S_IRUSR")-1, S_IRUSR TSRMLS_CC);
+	zend_declare_class_constant_long(uv_class_entry, "S_IWUSR",  sizeof("S_IWUSR")-1, S_IWUSR TSRMLS_CC);
+	zend_declare_class_constant_long(uv_class_entry, "S_IXUSR",  sizeof("S_IXUSR")-1, S_IXUSR TSRMLS_CC);
 	zend_declare_class_constant_long(uv_class_entry, "S_IRWXG",  sizeof("S_IRWXG")-1, S_IRWXG TSRMLS_CC);
 	zend_declare_class_constant_long(uv_class_entry, "S_IRGRP",  sizeof("S_IRGRP")-1, S_IRWXG TSRMLS_CC);
 	zend_declare_class_constant_long(uv_class_entry, "S_IWGRP",  sizeof("S_IWGRP")-1, S_IWGRP TSRMLS_CC);