diff --git a/vector/src/Data/Vector.hs b/vector/src/Data/Vector.hs
index 2793aa53..159061fd 100644
--- a/vector/src/Data/Vector.hs
+++ b/vector/src/Data/Vector.hs
@@ -293,9 +293,6 @@ instance Eq a => Eq (Vector a) where
   {-# INLINE (==) #-}
   xs == ys = Bundle.eq (G.stream xs) (G.stream ys)
 
-  {-# INLINE (/=) #-}
-  xs /= ys = not (Bundle.eq (G.stream xs) (G.stream ys))
-
 -- See http://trac.haskell.org/vector/ticket/12
 instance Ord a => Ord (Vector a) where
   {-# INLINE compare #-}
diff --git a/vector/src/Data/Vector/Primitive.hs b/vector/src/Data/Vector/Primitive.hs
index 225d1ace..33d8b36e 100644
--- a/vector/src/Data/Vector/Primitive.hs
+++ b/vector/src/Data/Vector/Primitive.hs
@@ -272,9 +272,6 @@ instance (Prim a, Eq a) => Eq (Vector a) where
   {-# INLINE (==) #-}
   xs == ys = Bundle.eq (G.stream xs) (G.stream ys)
 
-  {-# INLINE (/=) #-}
-  xs /= ys = not (Bundle.eq (G.stream xs) (G.stream ys))
-
 -- See http://trac.haskell.org/vector/ticket/12
 instance (Prim a, Ord a) => Ord (Vector a) where
   {-# INLINE compare #-}
diff --git a/vector/src/Data/Vector/Storable.hs b/vector/src/Data/Vector/Storable.hs
index 07d33612..1976a713 100644
--- a/vector/src/Data/Vector/Storable.hs
+++ b/vector/src/Data/Vector/Storable.hs
@@ -284,9 +284,6 @@ instance (Storable a, Eq a) => Eq (Vector a) where
   {-# INLINE (==) #-}
   xs == ys = Bundle.eq (G.stream xs) (G.stream ys)
 
-  {-# INLINE (/=) #-}
-  xs /= ys = not (Bundle.eq (G.stream xs) (G.stream ys))
-
 -- See http://trac.haskell.org/vector/ticket/12
 instance (Storable a, Ord a) => Ord (Vector a) where
   {-# INLINE compare #-}
diff --git a/vector/src/Data/Vector/Unboxed.hs b/vector/src/Data/Vector/Unboxed.hs
index 006ab852..0aa30259 100644
--- a/vector/src/Data/Vector/Unboxed.hs
+++ b/vector/src/Data/Vector/Unboxed.hs
@@ -234,9 +234,6 @@ instance (Unbox a, Eq a) => Eq (Vector a) where
   {-# INLINE (==) #-}
   xs == ys = Bundle.eq (G.stream xs) (G.stream ys)
 
-  {-# INLINE (/=) #-}
-  xs /= ys = not (Bundle.eq (G.stream xs) (G.stream ys))
-
 -- See http://trac.haskell.org/vector/ticket/12
 instance (Unbox a, Ord a) => Ord (Vector a) where
   {-# INLINE compare #-}