diff --git a/src/main.c b/src/main.c
index ccf1009..2eb50da 100644
--- a/src/main.c
+++ b/src/main.c
@@ -288,11 +288,10 @@ int parse_argv(int argc, const char **argv, struct options *opts) {
     }
 
     if (command_arg_num == 1) {
-        struct sockaddr test = {0};
-        int r = inet_pton(AF_INET, opts->addr, &test);
+        int r = inet_pton(AF_INET, opts->addr, NULL);
         if (r == -1)
-            r = inet_pton(AF_INET6, opts->addr, &test);
-        opts->is_alias_passed = r != 1;
+            r = inet_pton(AF_INET6, opts->addr, NULL);
+        opts->is_alias_passed = r == 0;
     }
         
         // opts->is_alias_passed = ((opts->addr[0]>>4) & 0xf) != 0x3;