diff --git a/electrum/commands.py b/electrum/commands.py
index 8e350def0..217f5aba7 100644
--- a/electrum/commands.py
+++ b/electrum/commands.py
@@ -1624,6 +1624,8 @@ class Commands(Logger):
     async def test_inject_fee_etas(self, fee_est):
         """
         Inject fee estimates into the network object, as if they were coming from connected servers.
+        `setconfig 'test_disable_automatic_fee_eta_update' true` to prevent Network from overriding
+        the configured fees.
         Useful on regtest.
 
         arg:str:fee_est:dict of ETA-based fee estimates, encoded as str
diff --git a/electrum/network.py b/electrum/network.py
index ea38ef04e..c49b48f9c 100644
--- a/electrum/network.py
+++ b/electrum/network.py
@@ -612,6 +612,8 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
 
     def update_fee_estimates(self, *, fee_est: Dict[int, int] = None):
         if fee_est is None:
+            if self.config.TEST_DISABLE_AUTOMATIC_FEE_ETA_UPDATE:
+                return
             fee_est = self.get_fee_estimates()
         for nblock_target, fee in fee_est.items():
             self.fee_estimates.set_data(nblock_target, fee)
diff --git a/electrum/simple_config.py b/electrum/simple_config.py
index f356f2696..b545d899b 100644
--- a/electrum/simple_config.py
+++ b/electrum/simple_config.py
@@ -775,6 +775,7 @@ Warning: setting this to too low will result in lots of payment failures."""),
     FEE_POLICY = ConfigVar('fee_policy.default', default='eta:2', type_=str)  # exposed to GUI
     FEE_POLICY_LIGHTNING = ConfigVar('fee_policy.lnwatcher', default='eta:2', type_=str)  # for txbatcher (sweeping)
     FEE_POLICY_SWAPS = ConfigVar('fee_policy.swaps', default='eta:2', type_=str)  # for txbatcher (sweeping and sending if we are a swapserver)
+    TEST_DISABLE_AUTOMATIC_FEE_ETA_UPDATE = ConfigVar('test_disable_automatic_fee_eta_update', default=False, type_=bool)
 
     RPC_USERNAME = ConfigVar('rpcuser', default=None, type_=str)
     RPC_PASSWORD = ConfigVar('rpcpassword', default=None, type_=str)
diff --git a/tests/regtest/regtest.sh b/tests/regtest/regtest.sh
index 0473c6577..c2c8301cb 100755
--- a/tests/regtest/regtest.sh
+++ b/tests/regtest/regtest.sh
@@ -331,6 +331,7 @@ if [[ $1 == "lnwatcher_waits_until_fees_go_down" ]]; then
     $alice setconfig test_force_disable_mpp true
     $alice setconfig test_force_mpp false
     wait_for_balance alice 1
+    $alice setconfig test_disable_automatic_fee_eta_update true
     $alice test_inject_fee_etas "{2:1000}"
     $bob test_inject_fee_etas "{2:1000}"
     echo "alice opens channel"