diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Changelog
 
+#### 0.6.3.1
+
+- `Build-tools` field is added to Cabal file.
+
 #### 0.6.3
 
 - Fixed some issues with string parsing. (#17)
diff --git a/language-lua.cabal b/language-lua.cabal
--- a/language-lua.cabal
+++ b/language-lua.cabal
@@ -3,7 +3,7 @@
 Description:
     Lua 5.2 lexer, parser and pretty-printer.
 
-Version:             0.6.3
+Version:             0.6.3.1
 Synopsis:            Lua parser and pretty-printer
 Homepage:            http://github.com/osa1/language-lua
 Bug-reports:         http://github.com/osa1/language-lua/issues
@@ -49,6 +49,8 @@
                      mtl >= 2.0 && < 2.3,
                      parsec >= 3.1.3 && < 3.2,
                      safe >= 0.3 && < 0.4
+
+  Build-tools:       alex
 
   ghc-options:       -Wall