diff --git a/src/index.js b/src/index.js
index dbb8e5d..bb0f709 100644
--- a/src/index.js
+++ b/src/index.js
@@ -68,7 +68,7 @@ function TCP () {
     var count = 0
     listeners.forEach((listener) => {
       listener.close(() => {
-        if (++count === listeners.length) {
+        if (++count === listeners.length && callback) {
           callback()
         }
       })