diff --git a/tools/benchmark_client/benchmark_client.cc b/tools/benchmark_client/benchmark_client.cc
index 18e636e033..940e851224 100644
--- a/tools/benchmark_client/benchmark_client.cc
+++ b/tools/benchmark_client/benchmark_client.cc
@@ -744,7 +744,7 @@ Status RunLRangeCommand(redisContext* c, ThreadArg* arg) {
 
 void* ThreadMain(void* arg) {
   ThreadArg* ta = reinterpret_cast<ThreadArg*>(arg);
-  last_seed = (int)pthread_self();
+  last_seed = ta->idx;
 
   if (FLAGS_command == "generate") {
     RunGenerateCommand(ta->idx);