diff --git a/api/app.py b/api/app.py
index 5cdc88e11f2b53..9830a809042348 100644
--- a/api/app.py
+++ b/api/app.py
@@ -17,7 +17,7 @@ def is_db_command():
     # It seems that JetBrains Python debugger does not work well with gevent,
     # so we need to disable gevent in debug mode.
     # If you are using debugpy and set GEVENT_SUPPORT=True, you can debug with gevent.
-    if (flask_debug := os.environ.get("FLASK_DEBUG", "0")) and flask_debug.lower() not in {"false", "0", "no"}:
+    if (flask_debug := os.environ.get("FLASK_DEBUG", "0")) and flask_debug.lower() in {"false", "0", "no"}:
         from gevent import monkey  # type: ignore
 
         # gevent