diff --git a/examples/petstore/client_async.py b/examples/petstore/client_async.py
index 20c45b6..6df82b9 100644
--- a/examples/petstore/client_async.py
+++ b/examples/petstore/client_async.py
@@ -464,7 +464,7 @@ async def getPetById(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> Pet | EmptyBody:
+    ) -> EmptyBody | Pet:
         url = self._get_url(f"/pet/{petId}")
 
         params = {}
@@ -744,7 +744,7 @@ async def getUserByName(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> User | EmptyBody:
+    ) -> EmptyBody | User:
         url = self._get_url(f"/user/{username}")
 
         params = {}
@@ -811,7 +811,7 @@ async def addPet(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> Pet | EmptyBody:
+    ) -> EmptyBody | Pet:
         url = self._get_url(f"/pet")
 
         params = {}
@@ -880,7 +880,7 @@ async def addPet(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> AddpetResponse200 | EmptyBody:
+    ) -> EmptyBody | AddpetResponse200:
         url = self._get_url(f"/pet_or_tag")
 
         params = {}
@@ -1257,7 +1257,7 @@ async def updatePet(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> Pet | EmptyBody:
+    ) -> EmptyBody | Pet:
         url = self._get_url(f"/pet")
 
         params = {}
diff --git a/examples/petstore/client_sync.py b/examples/petstore/client_sync.py
index 2011b19..8f6a42c 100644
--- a/examples/petstore/client_sync.py
+++ b/examples/petstore/client_sync.py
@@ -633,7 +633,7 @@ def loginUser(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> LoginuserResponse200 | EmptyBody:
+    ) -> EmptyBody | LoginuserResponse200:
         url = self._get_url(f"/user/login")
 
         params = {}
diff --git a/pyproject.toml b/pyproject.toml
index b41e9a7..008188b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pythogen"
-version = "0.1.32"
+version = "0.1.33"
 description = "Generator of python HTTP-clients from OpenApi specification."
 homepage = "https://github.com/artsmolin/pythogen"
 repository = "https://github.com/artsmolin/pythogen"
diff --git a/pythogen/models.py b/pythogen/models.py
index 377a0b3..d82ff4b 100644
--- a/pythogen/models.py
+++ b/pythogen/models.py
@@ -72,7 +72,7 @@ class Format(Enum):
     def _missing_(cls, value):
         value = re.sub('[_-]*', '', value)
         for member in cls:
-            if member.lower() == value:
+            if member.name.lower() == value:
                 return member
         return None
 
diff --git a/tests/clients/async_client.py b/tests/clients/async_client.py
index 584f10d..80fc7c1 100644
--- a/tests/clients/async_client.py
+++ b/tests/clients/async_client.py
@@ -579,7 +579,7 @@ async def get_object(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> UnknownError | GetObjectResp:
+    ) -> GetObjectResp | UnknownError:
         url = self._get_url(f"/objects/{object_id}")
 
         params = {
@@ -996,7 +996,7 @@ async def get_object_slow(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> UnknownError | GetObjectResp:
+    ) -> GetObjectResp | UnknownError:
         url = self._get_url(f"/slow/objects/{object_id}")
 
         params = {}
diff --git a/tests/clients/async_client_with_metrics.py b/tests/clients/async_client_with_metrics.py
index e32cebb..555ffe0 100644
--- a/tests/clients/async_client_with_metrics.py
+++ b/tests/clients/async_client_with_metrics.py
@@ -660,7 +660,7 @@ async def get_object(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> UnknownError | GetObjectResp:
+    ) -> GetObjectResp | UnknownError:
         url = self._get_url(f"/objects/{object_id}")
 
         params = {
@@ -1239,7 +1239,7 @@ async def get_object_slow(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> UnknownError | GetObjectResp:
+    ) -> GetObjectResp | UnknownError:
         url = self._get_url(f"/slow/objects/{object_id}")
 
         params = {}
diff --git a/tests/clients/sync_client_with_metrics.py b/tests/clients/sync_client_with_metrics.py
index 1445c6f..078f9d4 100644
--- a/tests/clients/sync_client_with_metrics.py
+++ b/tests/clients/sync_client_with_metrics.py
@@ -660,7 +660,7 @@ def get_object(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> GetObjectResp | UnknownError:
+    ) -> UnknownError | GetObjectResp:
         url = self._get_url(f"/objects/{object_id}")
 
         params = {
@@ -1239,7 +1239,7 @@ def get_object_slow(
         auth: BasicAuth | None = None,
         content: str | bytes | None = None,
         headers: dict[str, Any] | None = None,
-    ) -> GetObjectResp | UnknownError:
+    ) -> UnknownError | GetObjectResp:
         url = self._get_url(f"/slow/objects/{object_id}")
 
         params = {}