diff --git a/monitor.py b/monitor.py
index 2255a06..38dfc92 100644
--- a/monitor.py
+++ b/monitor.py
@@ -224,7 +224,7 @@ def fetch_and_analyze(session, verbose=False):
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="AdGuard Monitor Service")
-    parser.add_argument("--interval", type=int, default=15, help="Update interval in seconds")
+    parser.add_argument("--interval", type=int, default=int(os.getenv("MONITOR_INTERVAL", 15)), help="Update interval in seconds")
     parser.add_argument("--verbose", action="store_true", help="Log all queries for monitored clients")
     parser.add_argument("--test", action="store_true", help="Send a fake test notification and exit")
     args = parser.parse_args()