diff --git a/tests/test_translate_endpoint.py b/tests/test_translate_endpoint.py
index af7909c..95379cb 100644
--- a/tests/test_translate_endpoint.py
+++ b/tests/test_translate_endpoint.py
@@ -221,7 +221,7 @@ class TestFileValidation:
         response = authenticated_client.post(
             TRANSLATE_URL,
             files={
-                "file": ("test.pdf", io.BytesIO(invalid_content), "application/pdf")
+                "file": ("test.txt", io.BytesIO(invalid_content), "text/plain")
             },
             data={"target_lang": "fr"},
         )