diff --git a/sources/ClangSharp/ValueLazy`1.cs b/sources/ClangSharp/ValueLazy`1.cs
index 7d5edf36..645aacbb 100644
--- a/sources/ClangSharp/ValueLazy`1.cs
+++ b/sources/ClangSharp/ValueLazy`1.cs
@@ -32,6 +32,7 @@ public T Value
             if (_factory is Func<T> factory)
             {
                 _value = factory();
+                _factory = null;
             }
             return _value;
         }