diff --git a/LightInject/LightInject.cs b/LightInject/LightInject.cs
index d40cf9ae..efe11e15 100644
--- a/LightInject/LightInject.cs
+++ b/LightInject/LightInject.cs
@@ -6077,6 +6077,7 @@ private IEnumerable<ConstructorDependency> GetConstructorDependencies(Constructo
             foreach (var constructorDependency in constructorDependencies)
             {
                 constructorDependency.FactoryExpression =
+                    constructorDependency.FactoryExpression ??
                     getConstructorDependencyExpression(
                         constructorDependency.ServiceType,
                         constructorDependency.ServiceName);