diff --git a/containers/src/Data/IntMap/Internal.hs b/containers/src/Data/IntMap/Internal.hs
index d680cc2..7ba8be0 100644
--- a/containers/src/Data/IntMap/Internal.hs
+++ b/containers/src/Data/IntMap/Internal.hs
@@ -3272,7 +3272,6 @@ data Distinct = Distinct | Nondistinct
 --------------------------------------------------------------------}
 instance Eq a => Eq (IntMap a) where
   t1 == t2  = equal t1 t2
-  t1 /= t2  = nequal t1 t2
 
 equal :: Eq a => IntMap a -> IntMap a -> Bool
 equal (Bin p1 m1 l1 r1) (Bin p2 m2 l2 r2)
diff --git a/containers/src/Data/IntSet/Internal.hs b/containers/src/Data/IntSet/Internal.hs
index cb8a161..91e7b70 100644
--- a/containers/src/Data/IntSet/Internal.hs
+++ b/containers/src/Data/IntSet/Internal.hs
@@ -1193,7 +1193,6 @@ data Inserted = Inserted !IntSet ![Key]
 --------------------------------------------------------------------}
 instance Eq IntSet where
   t1 == t2  = equal t1 t2
-  t1 /= t2  = nequal t1 t2
 
 equal :: IntSet -> IntSet -> Bool
 equal (Bin p1 m1 l1 r1) (Bin p2 m2 l2 r2)