diff --git a/hledger-lib/Hledger/Data/Amount.hs b/hledger-lib/Hledger/Data/Amount.hs
index 0a95be89c..867f4d910 100644
--- a/hledger-lib/Hledger/Data/Amount.hs
+++ b/hledger-lib/Hledger/Data/Amount.hs
@@ -40,6 +40,10 @@ exchange rates.
 
 -}
 
+-- Silence safe 0.3.18's deprecation warnings for (max|min)imum(By)?Def for now
+-- (may hide other deprecation warnings too). https://github.com/ndmitchell/safe/issues/26
+{-# OPTIONS_GHC -Wno-warnings-deprecations #-}
+
 {-# LANGUAGE StandaloneDeriving, RecordWildCards, OverloadedStrings #-}
 
 module Hledger.Data.Amount (
diff --git a/hledger-lib/Hledger/Query.hs b/hledger-lib/Hledger/Query.hs
index 50c39c88f..d2c3b1327 100644
--- a/hledger-lib/Hledger/Query.hs
+++ b/hledger-lib/Hledger/Query.hs
@@ -5,6 +5,10 @@ transactions..)  by various criteria, and a SimpleTextParser for query expressio
 
 -}
 
+-- Silence safe 0.3.18's deprecation warnings for (max|min)imum(By)?Def for now
+-- (may hide other deprecation warnings too). https://github.com/ndmitchell/safe/issues/26
+{-# OPTIONS_GHC -Wno-warnings-deprecations #-}
+
 {-# LANGUAGE DeriveDataTypeable, OverloadedStrings, ViewPatterns #-}
 {-# LANGUAGE CPP #-}