diff --git a/lib/esbonio/esbonio/sphinx_agent/handlers/diagnostics.py b/lib/esbonio/esbonio/sphinx_agent/handlers/diagnostics.py
index 1b1f3588..1a80a478 100644
--- a/lib/esbonio/esbonio/sphinx_agent/handlers/diagnostics.py
+++ b/lib/esbonio/esbonio/sphinx_agent/handlers/diagnostics.py
@@ -49,4 +49,4 @@ def setup(app: Sphinx):
     # This ensures proper synchronization of data, as some extensions, like
     # sphinx-needs, emit diagnostics during the "build-finished" event.
     # Setting priority to 900 ensures this handler runs after typical operations.
-    app.connect("build-finished", sync_diagnostics, priority = 900)
+    app.connect("build-finished", sync_diagnostics, priority=900)