diff --git a/source/vibe/core/concurrency.d b/source/vibe/core/concurrency.d
index 657a511..baee1c0 100644
--- a/source/vibe/core/concurrency.d
+++ b/source/vibe/core/concurrency.d
@@ -37,11 +37,17 @@ pure nothrow @safe {
 	return ScopedLock!T(object);
 }
 /// ditto
-void lock(T : const(Object))(shared(T) object, scope void delegate(scope T) accessor)
+void lock(T : const(Object))(shared(T) object, scope void delegate(scope T) nothrow accessor)
 nothrow {
 	auto l = lock(object);
 	accessor(l.unsafeGet());
 }
+/// ditto
+void lock(T : const(Object))(shared(T) object, scope void delegate(scope T) accessor)
+{
+	auto l = lock(object);
+	accessor(l.unsafeGet());
+}
 
 ///
 unittest {