diff --git a/src/cleverswarm_python_client/libs/cleverswarm_client.py b/src/cleverswarm_python_client/libs/cleverswarm_client.py
index 63117c9..da59877 100644
--- a/src/cleverswarm_python_client/libs/cleverswarm_client.py
+++ b/src/cleverswarm_python_client/libs/cleverswarm_client.py
@@ -635,7 +635,12 @@ class CleverSwarmClient(object):
                 files.append(("ontology", open(ontology_file, "rb")))
 
             response = requests.post(
-                self._base_url + "unstructured/with_ontology",
+                self._base_url
+                + (
+                    "unstructured/with_ontology"
+                    if ontology_file
+                    else "unstructured/with_ontology_simple"
+                ),
                 headers=headers,
                 params=params,
                 files=files,
@@ -715,7 +720,12 @@ class CleverSwarmClient(object):
                 files.append(("ontology", open(ontology_file, "rb")))
 
             response = requests.post(
-                self._base_url + "unstructured/with_wildcards",
+                self._base_url
+                + (
+                    "unstructured/with_wildcards"
+                    if ontology_file
+                    else "unstructured/with_wildcards_simple"
+                ),
                 headers=headers,
                 params=params,
                 files=files,