diff --git a/hix.cabal b/hix.cabal
--- a/hix.cabal
+++ b/hix.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           hix
-version:        0.4.1
+version:        0.4.2
 synopsis:       Haskell/Nix development build tools
 description:    See https://hackage.haskell.org/package/hix/docs/Hix.html
 category:       Build
diff --git a/lib/Hix/Preproc.hs b/lib/Hix/Preproc.hs
--- a/lib/Hix/Preproc.hs
+++ b/lib/Hix/Preproc.hs
@@ -201,7 +201,7 @@
 
 preludeRegex :: Regex
 preludeRegex =
-  [regex|^import\s*((?:"[^"]+" )?\s*)(?:qualified )?\s*(Prelude)|]
+  [regex|^import\s+(?:qualified\s+)?((?:"[^"]+"\s+)?)(Prelude)|]
 
 replacePrelude :: ByteString -> Prelude -> Maybe ByteString
 replacePrelude l Prelude {..}
diff --git a/test/Hix/Test/PreprocTest.hs b/test/Hix/Test/PreprocTest.hs
--- a/test/Hix/Test/PreprocTest.hs
+++ b/test/Hix/Test/PreprocTest.hs
@@ -100,6 +100,7 @@
 import "base" Prelude (sum)
 import Data.List
 import Prelude hiding (Maybe)
+import qualified Prelude as P
 import Data.Maybe
 
 f :: Int
@@ -123,10 +124,11 @@
 import "incipit-base" IncipitBase (sum)
 import Data.List
 import "incipit-base" IncipitBase hiding (Maybe)
+import qualified "incipit-base" IncipitBase as P
 import Data.Maybe
 
 type Hix_Dummy = Int
-{-# line 15 "/foo/bar/Foo.hs" #-}
+{-# line 16 "/foo/bar/Foo.hs" #-}
 f :: Int
 f = 1
 |]