diff --git a/ouroboros-consensus/test/consensus-test/Test/Consensus/MiniProtocol/BlockFetch/Client.hs b/ouroboros-consensus/test/consensus-test/Test/Consensus/MiniProtocol/BlockFetch/Client.hs
index 56abcb3238..4ec86be09b 100644
--- a/ouroboros-consensus/test/consensus-test/Test/Consensus/MiniProtocol/BlockFetch/Client.hs
+++ b/ouroboros-consensus/test/consensus-test/Test/Consensus/MiniProtocol/BlockFetch/Client.hs
@@ -5,7 +5,6 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE LambdaCase                 #-}
 {-# LANGUAGE NamedFieldPuns             #-}
-{-# LANGUAGE NumericUnderscores         #-}
 {-# LANGUAGE RecordWildCards            #-}
 {-# LANGUAGE ScopedTypeVariables        #-}
 {-# LANGUAGE TupleSections              #-}