diff --git a/background_gtfs.py b/background_gtfs.py
index 1db3119..2f18fc0 100644
--- a/background_gtfs.py
+++ b/background_gtfs.py
@@ -15,4 +15,4 @@ if __name__ == '__main__':
         o, e =  procesa_zip()
         print(o)
         print(e)
-        time.sleep(os.environ.get('INTERVAL'))
+        time.sleep(int(os.environ.get('INTERVAL')))