diff --git a/server/http_server.c b/server/http_server.c
index f71c9b7..9a1f0f8 100644
--- a/server/http_server.c
+++ b/server/http_server.c
@@ -24,7 +24,8 @@ void handle_signal(int signal) {
 
 int main(int argc, char* argv[]) {
     if (argc != 2) {
-        printf("%s", USAGE_STRING);
+        printf("%s\n", USAGE_STRING);
+        return 1;
     }
     char *port = argv[1];
     long port_num = strtol(port, NULL, 10);