diff --git a/chia/cmds/configure.py b/chia/cmds/configure.py
index c269964d8df3..c45ee38c87d4 100644
--- a/chia/cmds/configure.py
+++ b/chia/cmds/configure.py
@@ -4,9 +4,11 @@
 from typing import Optional
 
 import click
+import yaml
 
 from chia.server.outbound_message import NodeType
 from chia.util.config import (
+    initial_config_file,
     load_defaults_for_missing_services,
     lock_and_load_config,
     save_config,
@@ -103,6 +105,24 @@ def configure(
         if testnet:
             if testnet == "true" or testnet == "t":
                 print("Setting Testnet")
+                # check if network_overrides.constants.testnet11 exists
+                if (
+                    "testnet11" not in config["network_overrides"]["constants"]
+                    or "testnet11" not in config["network_overrides"]["config"]
+                ):
+                    print("Testnet11 constants missing. Adding to config...")
+                    initial_config_str: str = initial_config_file("config.yaml")
+                    initial_config = yaml.safe_load(initial_config_str)
+                    if "testnet11" not in config["network_overrides"]["constants"]:
+                        config["network_overrides"]["constants"]["testnet11"] = initial_config["network_overrides"][
+                            "constants"
+                        ]["testnet11"]
+
+                    if "testnet11" not in config["network_overrides"]["config"]:
+                        config["network_overrides"]["config"]["testnet11"] = initial_config["network_overrides"][
+                            "config"
+                        ]["testnet11"]
+
                 testnet_port = "58444"
                 testnet_introducer = "introducer-testnet11.chia.net"
                 testnet_dns_introducer = "dns-introducer-testnet11.chia.net"