diff --git a/examples/main.cpp b/examples/main.cpp
index 0412d431..6cae6aca 100644
--- a/examples/main.cpp
+++ b/examples/main.cpp
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <ctime>
 #include <fstream>
 #include <iostream>
 #include <random>
@@ -28,18 +29,17 @@
 #define TXT2IMG "txt2img"
 #define IMG2IMG "img2img"
 
-// get_num_physical_cores is copy from 
+// get_num_physical_cores is copy from
 // https://github.com/ggerganov/llama.cpp/blob/master/examples/common.cpp
 // LICENSE: https://github.com/ggerganov/llama.cpp/blob/master/LICENSE
 int32_t get_num_physical_cores() {
 #ifdef __linux__
     // enumerate the set of thread siblings, num entries is num cores
     std::unordered_set<std::string> siblings;
-    for (uint32_t cpu=0; cpu < UINT32_MAX; ++cpu) {
-        std::ifstream thread_siblings("/sys/devices/system/cpu"
-            + std::to_string(cpu) + "/topology/thread_siblings");
+    for (uint32_t cpu = 0; cpu < UINT32_MAX; ++cpu) {
+        std::ifstream thread_siblings("/sys/devices/system/cpu" + std::to_string(cpu) + "/topology/thread_siblings");
         if (!thread_siblings.is_open()) {
-            break; // no more cpus
+            break;  // no more cpus
         }
         std::string line;
         if (std::getline(thread_siblings, line)) {
@@ -61,7 +61,7 @@ int32_t get_num_physical_cores() {
         return num_physical_cores;
     }
 #elif defined(_WIN32)
-    //TODO: Implement
+    // TODO: Implement
 #endif
     unsigned int n_threads = std::thread::hardware_concurrency();
     return n_threads > 0 ? (n_threads <= 4 ? n_threads : n_threads / 2) : 4;
@@ -282,6 +282,11 @@ void parse_args(int argc, const char* argv[], Option* opt) {
         fprintf(stderr, "error: can only work with strength in [0.0, 1.0]\n");
         exit(1);
     }
+
+    if (opt->seed < 0) {
+        srand((int)time(NULL));
+        opt->seed = rand();
+    }
 }
 
 int main(int argc, const char* argv[]) {