diff --git a/hpack.cabal b/hpack.cabal
--- a/hpack.cabal
+++ b/hpack.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.32.0.
+-- This file has been generated from package.yaml by hpack version 0.33.0.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: dc706425edd9fa60b9662cefde8da5d890fb9cf19c8f0f9e01733b763bfcd06a
+-- hash: 55dc38c5a69ab1a5dc744c1e8322a562cf343c8f4f84380100024f10784994b6
 
 name:           hpack
-version:        0.33.0
+version:        0.33.0.1
 synopsis:       A modern format for Haskell packages
 description:    See README at <https://github.com/sol/hpack#readme>
 category:       Development
diff --git a/src/Hpack.hs b/src/Hpack.hs
--- a/src/Hpack.hs
+++ b/src/Hpack.hs
@@ -48,7 +48,7 @@
 import           System.IO (stderr)
 import           Data.Aeson (Value)
 
-import           Paths_hpack (version)
+import           Paths_hpack ()
 import           Hpack.Options
 import           Hpack.Config
 import           Hpack.Render
@@ -56,6 +56,9 @@
 import           Hpack.Utf8 as Utf8
 import           Hpack.CabalFile
 
+version :: Version
+version = makeVersion [0,33,0]
+
 programVersion :: Version -> String
 programVersion v = "hpack version " ++ Version.showVersion v
 
@@ -156,11 +159,11 @@
 
 mkStatus :: [String] -> Version -> CabalFile -> Status
 mkStatus new v (CabalFile mOldVersion mHash old) = case (mOldVersion, mHash) of
+  (_, _) | old == new -> OutputUnchanged
   (Nothing, _) -> ExistingCabalFileWasModifiedManually
   (Just oldVersion, _) | oldVersion < makeVersion [0, 20, 0] -> Generated
   (_, Nothing) -> ExistingCabalFileWasModifiedManually
   (Just oldVersion, Just hash)
-    | old == new -> OutputUnchanged
     | v < oldVersion -> AlreadyGeneratedByNewerHpack
     | sha256 (unlines old) /= hash -> ExistingCabalFileWasModifiedManually
     | otherwise -> Generated
diff --git a/test/HpackSpec.hs b/test/HpackSpec.hs
--- a/test/HpackSpec.hs
+++ b/test/HpackSpec.hs
@@ -6,6 +6,7 @@
 import qualified Prelude as Prelude
 
 import           Control.DeepSeq
+import           Data.List
 
 import           Hpack.Config
 import           Hpack.CabalFile
@@ -60,6 +61,13 @@
             writeFile file existing
             hpack `shouldReturn` modifiedManually
             readFile file `shouldReturn` existing
+
+          context "when only the the cabal file header changed" $ do
+            it "does not complain if it's newer" $ do
+              hpack `shouldReturn` generated
+              let removeHash = unlines . filter (not . isInfixOf "hash") . lines
+              readFile file >>= writeFile file . removeHash
+              hpack `shouldReturn` outputUnchanged
 
         context "when hash is present" $ do
           context "when exsting cabal file was generated with a newer version of hpack" $ do