diff --git a/src/openflexure_microscope_server/logging.py b/src/openflexure_microscope_server/logging.py
index 5ecd8a6d..47c767ff 100644
--- a/src/openflexure_microscope_server/logging.py
+++ b/src/openflexure_microscope_server/logging.py
@@ -86,7 +86,7 @@ def configure_logging(log_folder: str, debug: bool = False) -> None:
     )
 
 
-def retrieve_log() -> PlainTextResponse:
+def retrieve_log() -> JSONResponse:
     """Return logs since the server started, up to a maximum of 250 messages.
 
     This log is the one shown in the UI and on the logging page.