diff --git a/NanoProlog.cabal b/NanoProlog.cabal
--- a/NanoProlog.cabal
+++ b/NanoProlog.cabal
@@ -1,5 +1,5 @@
 Name:                NanoProlog
-Version:             0.2.3
+Version:             0.2.3.1
 Synopsis:            Very small  interpreter for a Prolog-like language
 Description:         This package was developed to demonstrate the ideas behind
                      the Prolog language. It contains a very small interpreter
@@ -33,8 +33,7 @@
     uu-parsinglib >= 2.7.1
 
 Library
-  Build-Depends:	  base >= 4.0 && < 5.0,
-                    haskell98 >= 1.1.0.1,
+  Build-Depends:    base >= 4.0 && < 5.0,
                     uu-parsinglib >= 2.7.1,
                     ListLike == 3.1.*,
                     containers == 0.4.*
diff --git a/src/Language/Prolog/NanoProlog/Interpreter.hs b/src/Language/Prolog/NanoProlog/Interpreter.hs
--- a/src/Language/Prolog/NanoProlog/Interpreter.hs
+++ b/src/Language/Prolog/NanoProlog/Interpreter.hs
@@ -2,7 +2,7 @@
 
 import            Language.Prolog.NanoProlog.NanoProlog
 import            Text.ParserCombinators.UU
-import            System (getArgs)
+import            System.Environment
 import            System.IO
 
 -- * Running the Interpreter