diff --git a/src/libs/utils/terminalinterface.cpp b/src/libs/utils/terminalinterface.cpp
index 7046d7855ca..9b6e6457102 100644
--- a/src/libs/utils/terminalinterface.cpp
+++ b/src/libs/utils/terminalinterface.cpp
@@ -183,6 +183,8 @@ void TerminalInterface::onStubReadyRead()
             emitFinished(out.mid(5).toInt(), QProcess::NormalExit);
         } else if (out.startsWith("crash ")) {
             emitFinished(out.mid(6).toInt(), QProcess::CrashExit);
+        } else if (out.startsWith("ack ")) {
+            qCDebug(terminalInterfaceLog) << "Received ack from stub: " << out;
         } else {
             emitError(QProcess::UnknownError, msgUnexpectedOutput(out));
             break;
diff --git a/src/tools/process_stub/main.cpp b/src/tools/process_stub/main.cpp
index d5fdc2f4086..bfb6f6c3211 100644
--- a/src/tools/process_stub/main.cpp
+++ b/src/tools/process_stub/main.cpp
@@ -542,6 +542,8 @@ void onControlSocketReadyRead()
             break;
         }
         }
+
+        sendMsg(QString("ack %1\n").arg(ch).toUtf8());
     }
 }