diff --git a/test/cctest/test_inspector_socket_server.cc b/test/cctest/test_inspector_socket_server.cc
index 4e4ebbc32854ac..7d5d0929def26b 100644
--- a/test/cctest/test_inspector_socket_server.cc
+++ b/test/cctest/test_inspector_socket_server.cc
@@ -354,6 +354,7 @@ class TestSocketServerDelegate : public SocketServerDelegate {
 
 ServerHolder::ServerHolder(bool has_targets, uv_loop_t* loop,
                            const std::string& host, int port, FILE* out) {
+  session_id_ = 0;
   std::vector<std::string> targets;
   if (has_targets)
     targets = { MAIN_TARGET_ID };