1 files changed, 6 insertions, 2 deletions
diff --git a/lib/cluster.js b/lib/cluster.js
index a4b82ca1cc..45cbf5f772 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -299,6 +299,7 @@ function masterInit() {
   function createWorkerProcess(id, env) {
     var workerEnv = util._extend({}, process.env);
     var execArgv = cluster.settings.execArgv.slice();
+    var debugPort = 0;
 
     workerEnv = util._extend(workerEnv, env);
     workerEnv.NODE_UNIQUE_ID = '' + id;
@@ -309,8 +310,11 @@ function masterInit() {
       );
 
       if (match) {
-        const debugPort = process.debugPort + debugPortOffset;
-        ++debugPortOffset;
+        if (debugPort === 0) {
+          debugPort = process.debugPort + debugPortOffset;
+          ++debugPortOffset;
+        }
+
         execArgv[i] = match[1] + '=' + debugPort;
       }
     }