diff --git a/examples/foobar.c b/examples/foobar.c
index 43691f7..983974d 100644
--- a/examples/foobar.c
+++ b/examples/foobar.c
@@ -3,9 +3,15 @@
 int main(int argc, char** argv) {
 
     mpc_result_t r;
-    mpc_parser_t* Foobar = mpc_new("foobar");
+    mpc_parser_t* Foobar;
+
+    if (argc != 2) {
+      printf("Usage: ./foobar <foo/bar>\n");
+      exit(0);
+    }
+
+    Foobar = mpc_new("foobar");
     mpca_lang(MPCA_LANG_DEFAULT, "foobar : \"foo\" | \"bar\";", Foobar);
-    (void)argc;
     
     if (mpc_parse("<stdin>", argv[1], Foobar, &r)) {
         mpc_ast_print(r.output);
@@ -14,7 +20,9 @@ int main(int argc, char** argv) {
         mpc_err_print(r.error);
         mpc_err_delete(r.error);
     }
+    
     mpc_cleanup(1, Foobar);
+    
     return 0;
 }