diff --git a/include/boost/coroutine2/detail/push_coroutine.hpp b/include/boost/coroutine2/detail/push_coroutine.hpp
index 4b183a7..45ae170 100644
--- a/include/boost/coroutine2/detail/push_coroutine.hpp
+++ b/include/boost/coroutine2/detail/push_coroutine.hpp
@@ -133,8 +133,7 @@ public:
 
     push_coroutine & operator=( push_coroutine && other) noexcept {
         if ( this == & other) return * this;
-        cb_ = other.cb_;
-        other.cb_ = nullptr;
+        std::swap(cb_, other.cb_);
         return * this;
     }
 
@@ -211,8 +210,7 @@ public:
 
     push_coroutine & operator=( push_coroutine && other) noexcept {
         if ( this == & other) return * this;
-        cb_ = other.cb_;
-        other.cb_ = nullptr;
+        std::swap(cb_, other.cb_);
         return * this;
     }