diff --git a/caller.py b/caller.py
index 4cb5fe5..88740d3 100644
--- a/caller.py
+++ b/caller.py
@@ -115,4 +115,4 @@ if not ret:
 
 customer_data=buf[key]['customer database']
 app.set_customer_data(customer_data)
-app.app.run(port=5001)
+app.app.run(host="0.0.0.0", port=5001)