diff --git a/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache b/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
index b06ddfd3a28f..e9a641479ba8 100644
--- a/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python-pydantic-v1/api_client.mustache
@@ -584,7 +584,7 @@ class ApiClient:
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, str(value)) for value in v)
+                    new_params.extend((k, quote(str(value))) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py b/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
index c71b3c27b311..4ae7c7efde39 100644
--- a/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-pydantic-v1/openapi_client/api_client.py
@@ -509,7 +509,7 @@ def parameters_to_tuples(self, params, collection_formats):
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, value) for value in v)
+                    new_params.extend((k, quote(value)) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
@@ -546,7 +546,7 @@ def parameters_to_url_query(self, params, collection_formats):
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, str(value)) for value in v)
+                    new_params.extend((k, quote(str(value))) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '
diff --git a/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
index 08d8d790c4f6..3581aae40035 100644
--- a/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-pydantic-v1-aiohttp/petstore_api/api_client.py
@@ -516,7 +516,7 @@ def parameters_to_url_query(self, params, collection_formats):
             if k in collection_formats:
                 collection_format = collection_formats[k]
                 if collection_format == 'multi':
-                    new_params.extend((k, str(value)) for value in v)
+                    new_params.extend((k, quote(str(value))) for value in v)
                 else:
                     if collection_format == 'ssv':
                         delimiter = ' '