diff --git a/src/pydantic_yaml/examples/base_models.py b/src/pydantic_yaml/examples/base_models.py
index 20d8108..1562c09 100644
--- a/src/pydantic_yaml/examples/base_models.py
+++ b/src/pydantic_yaml/examples/base_models.py
@@ -34,7 +34,7 @@ class B(BaseModel):
 class Recursive(BaseModel):
     """Recursive model, which is actually unsupported."""
 
-    inner: "Recursive" | None
+    inner: "Recursive | None"
     a: int  # Doesn't work!