diff --git a/CommandLineInterface.cpp b/CommandLineInterface.cpp
index 01d8f8485..6ed90cdea 100644
--- a/CommandLineInterface.cpp
+++ b/CommandLineInterface.cpp
@@ -345,18 +345,11 @@ bool CommandLineInterface::processInput()
 void CommandLineInterface::handleAst(string const& _argStr)
 {
 	string title;
-	string suffix;
 
 	if (_argStr == g_argAstStr)
-	{
 		title = "Syntax trees:";
-		suffix = ".ast";
-	}
 	else if (_argStr == g_argAstJson)
-	{
 		title = "JSON AST:";
-		suffix = ".json";
-	}
 	else
 		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Illegal argStr for AST"));