diff --git a/src/shrpx.cc b/src/shrpx.cc
index 343dc070..5aa5885f 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -249,6 +249,12 @@ void exec_binary(SignalServer *ssv) {
   shrpx_signal_unset_master_proc_ign_handler();
 
   rv = shrpx_signal_unblock_all();
+
+  if (setsid() == -1) {
+    auto error = errno;
+    LOG(ERROR) << "setsid() failed: " << strerror(error);
+  }
+
   if (rv != 0) {
     auto error = errno;
     LOG(ERROR) << "Unblocking all signals failed: " << strerror(error);