diff --git a/spec/test_d_lexer.d b/spec/test_d_lexer.d
index cd4649c..d03f9ae 100644
--- a/spec/test_d_lexer.d
+++ b/spec/test_d_lexer.d
@@ -60,4 +60,7 @@ unittest
     assert(lexer.lex_token() == LT(1, 4, 1, Testparser.TOKEN_PLUS));
     assert(lexer.lex_token() == LT(1, 6, 3, Testparser.TOKEN_INT));
     assert(lexer.lex_token() == LT(1, 9, 0, Testparser.TOKEN_EOF));
+
+    lexer = new Testparser.Lexer(null, 0u);
+    assert(lexer.lex_token() == LT(0, 0, 0, Testparser.TOKEN_EOF));
 }