diff --git a/src/context.cpp b/src/context.cpp
index 90f9aaf0..e76bc4d2 100644
--- a/src/context.cpp
+++ b/src/context.cpp
@@ -30,9 +30,11 @@ class main_context final : public context {
 class dispatcher_context final : public context {
 private:
     boost::context::fiber
-    run_( boost::context::fiber && c) {
 #if (defined(BOOST_USE_UCONTEXT)||defined(BOOST_USE_WINFIB))
+    run_( boost::context::fiber && c) {
         std::move( c).resume();
+#else
+    run_( boost::context::fiber &&) {
 #endif
 		// execute scheduler::dispatch()
 		return get_scheduler()->dispatch();