diff --git a/rest_auth/serializers.py b/rest_auth/serializers.py
index b9a9c92..af4725e 100644
--- a/rest_auth/serializers.py
+++ b/rest_auth/serializers.py
@@ -75,7 +75,7 @@ class UserUpdateSerializer(DynamicFieldsModelSerializer):
 
 
 
-def get_user_registration_profile_serializer():
+def get_user_registration_profile_serializer(*args, **kwargs):
     if profile_model_path():
         class UserRegistrationProfileSerializer(serializers.ModelSerializer):
 
@@ -93,7 +93,7 @@ def get_user_registration_profile_serializer():
     return UserRegistrationProfileSerializer
 
 
-def get_user_profile_serializer():
+def get_user_profile_serializer(*args, **kwargs):
     if profile_model_path():
         class UserProfileSerializer(serializers.ModelSerializer):
 
@@ -115,7 +115,7 @@ def get_user_profile_serializer():
     return UserProfileSerializer
 
 
-def get_user_profile_update_serializer():
+def get_user_profile_update_serializer(*args, **kwargs):
     if profile_model_path():
         class UserProfileUpdateSerializer(serializers.ModelSerializer):
 
diff --git a/rest_auth/views.py b/rest_auth/views.py
index 0241d0a..0ed29f7 100644
--- a/rest_auth/views.py
+++ b/rest_auth/views.py
@@ -185,6 +185,11 @@ class UserDetails(LoggedInRESTAPIView, GenericAPIView):
         Optional: email, first_name, last_name and UserProfile fields
     Returns the updated UserProfile and/or User object.
     """
+    if get_user_profile_model():
+        serializer_class = get_user_profile_update_serializer()
+    else:
+        serializer_class = UserUpdateSerializer
+
     def get_profile_serializer_class(self):
         return get_user_profile_serializer()