diff --git a/src/Injectio.Generators/ServiceRegistrationWriter.cs b/src/Injectio.Generators/ServiceRegistrationWriter.cs
index e2b50b6..b33eb46 100644
--- a/src/Injectio.Generators/ServiceRegistrationWriter.cs
+++ b/src/Injectio.Generators/ServiceRegistrationWriter.cs
@@ -203,7 +203,7 @@ private static void WriteServiceType(
             .IncrementIndent()
             .AppendLine("serviceCollection,")
             .Append("global::Microsoft.Extensions.DependencyInjection.ServiceDescriptor.")
-            .Append(serviceRegistration.ServiceKey != null ? "DescribeKeyed" : "Describe")
+            .Append(serviceRegistration.ServiceKey.HasValue()  ? "DescribeKeyed" : "Describe")
             .AppendLine("(")
             .IncrementIndent()
             .Append("typeof(")
@@ -211,7 +211,7 @@ private static void WriteServiceType(
             .Append(serviceType)
             .AppendLine("),");
 
-        if (serviceRegistration.ServiceKey != null)
+        if (serviceRegistration.ServiceKey.HasValue())
         {
             codeBuilder
                 .Append(serviceRegistration.ServiceKey)