int main(int argc, char **argv)
 {
-       const char *usage = "test-urlmatch-normalization [-p | -l] <url1> | <url1> <url2>";
+       const char usage[] = "test-urlmatch-normalization [-p | -l] <url1> | <url1> <url2>";
        char *url1, *url2;
        int opt_p = 0, opt_l = 0;
 
        }
 
        if (argc < 2 || argc > 3)
-               die(usage);
+               die("%s", usage);
 
        if (argc == 2) {
                struct url_info info;
        }
 
        if (opt_p || opt_l)
-               die(usage);
+               die("%s", usage);
 
        url1 = url_normalize(argv[1], NULL);
        url2 = url_normalize(argv[2], NULL);