diff --git a/zerver/openapi/openapi.py b/zerver/openapi/openapi.py
index 53a88b9269..30dd064742 100644
--- a/zerver/openapi/openapi.py
+++ b/zerver/openapi/openapi.py
@@ -103,7 +103,7 @@ class OpenAPISpec:
 
             openapi = yaml.load(f, Loader=yaml.CSafeLoader)
 
-        spec = Spec.create(openapi)
+        spec = Spec.from_dict(openapi)
         self._spec = spec
         self._openapi = naively_merge_allOf_dict(JsonRef.replace_refs(openapi))
         self.create_endpoints_dict()