diff --git a/include/boost/fiber/condition_variable.hpp b/include/boost/fiber/condition_variable.hpp
index 404917f0..47665da2 100644
--- a/include/boost/fiber/condition_variable.hpp
+++ b/include/boost/fiber/condition_variable.hpp
@@ -33,7 +33,10 @@
 namespace boost {
 namespace fibers {
 
-using cv_status = std::cv_status;
+enum class cv_status {
+    no_timeout = 1,
+    timeout
+};
 
 class BOOST_FIBERS_DECL condition_variable_any {
 private: