diff --git a/Hungarian-Munkres.cabal b/Hungarian-Munkres.cabal
--- a/Hungarian-Munkres.cabal
+++ b/Hungarian-Munkres.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                Hungarian-Munkres
-version:             0.1.2
+version:             0.1.3
 synopsis:            A Linear Sum Assignment Problem (LSAP) solver
 description:         This library provide a Haskell binding to the libhungarian,
                      a solver for Linear Sum Assignment Problem (LSAP) implemented
@@ -16,7 +16,7 @@
 copyright:           (c) 2014 Kai Zhang
 category:            Algorithm
 build-type:          Simple
--- extra-source-files:  
+extra-source-files:  cbits/hungarian.h
 cabal-version:       >=1.10
 
 library
@@ -25,9 +25,7 @@
   -- other-extensions:    
   build-depends:       base >=4.7 && <4.8
   hs-source-dirs:      src
-  c-sources:
-      cbits/hungarian.c
-    , cbits/hungarian.h
+  c-sources:           cbits/hungarian.c
 
   default-language:    Haskell2010