diff --git a/docker/gunicorn.conf.py b/docker/gunicorn.conf.py
index c91eaa8..f86de35 100644
--- a/docker/gunicorn.conf.py
+++ b/docker/gunicorn.conf.py
@@ -25,3 +25,12 @@ def on_starting(server):
 
 def post_worker_init(worker):
     logging.getLogger("gunicorn.access").addFilter(_filter)
+    from library.apps import _run_startup_probe, _should_skip_probe
+
+    if not _should_skip_probe():
+        try:
+            _run_startup_probe()
+        except Exception as exc:
+            logging.getLogger("library.apps").warning(
+                "Startup probe crashed: %s", exc, exc_info=True
+            )
diff --git a/mnemosyne/library/apps.py b/mnemosyne/library/apps.py
index 3995e95..2a39b5b 100644
--- a/mnemosyne/library/apps.py
+++ b/mnemosyne/library/apps.py
@@ -199,17 +199,4 @@ class LibraryConfig(AppConfig):
     verbose_name = "Library"
 
     def ready(self):
-        if _should_skip_probe():
-            return
-        import threading
-
-        t = threading.Thread(target=self._probe_thread, daemon=True)
-        t.start()
-        t.join(timeout=10)
-
-    def _probe_thread(self):
-        try:
-            _run_startup_probe()
-        except Exception as exc:
-            # Never let the probe itself take down the process.
-            logger.warning("Startup probe crashed: %s", exc, exc_info=True)
+        pass