diff --git a/source/TestUtils/PeanutButter.RandomGenerators/RequireUnique.cs b/source/TestUtils/PeanutButter.RandomGenerators/RequireUnique.cs
index 0eb921bd61..d669060c54 100644
--- a/source/TestUtils/PeanutButter.RandomGenerators/RequireUnique.cs
+++ b/source/TestUtils/PeanutButter.RandomGenerators/RequireUnique.cs
@@ -43,7 +43,7 @@ public RequireUnique(string propertyName)
     /// <inheritdoc />
     public override void Init(Type entityType)
     {
-        if (PropertyType == null)
+        if (PropertyType is null)
         {
             throw new InvalidOperationException(
                 $@"Inheritors of {