diff --git a/src/tools/moc/moc.cpp b/src/tools/moc/moc.cpp
index 9c18c3a8626..0fbadfc061a 100644
--- a/src/tools/moc/moc.cpp
+++ b/src/tools/moc/moc.cpp
@@ -2020,6 +2020,9 @@ QJsonObject FunctionDef::toJson() const
     if (revision > 0)
         fdef["revision"_L1] = revision;
 
+    if (wasCloned)
+        fdef["isCloned"_L1] = true;
+
     return fdef;
 }
 
diff --git a/tests/auto/tools/moc/CMakeLists.txt b/tests/auto/tools/moc/CMakeLists.txt
index b01b92b6345..4fac3f89dac 100644
--- a/tests/auto/tools/moc/CMakeLists.txt
+++ b/tests/auto/tools/moc/CMakeLists.txt
@@ -41,6 +41,7 @@ set(JSON_HEADERS
         related-metaobjects-in-gadget.h
         related-metaobjects-in-namespaces.h
         related-metaobjects-name-conflict.h
+        signal-with-default-arg.h
         single-quote-digit-separator-n3781.h
         single_function_keyword.h
         slots-with-void-template.h
diff --git a/tests/auto/tools/moc/allmocs_baseline_in.json b/tests/auto/tools/moc/allmocs_baseline_in.json
index e1c6a5d7d84..46f643d09b0 100644
--- a/tests/auto/tools/moc/allmocs_baseline_in.json
+++ b/tests/auto/tools/moc/allmocs_baseline_in.json
@@ -2447,6 +2447,42 @@
         "inputFile": "related-metaobjects-name-conflict.h",
         "outputRevision": 68
     },
+    {
+        "classes": [
+            {
+                "className": "SignalWithDefaultArg",
+                "object": true,
+                "qualifiedClassName": "SignalWithDefaultArg",
+                "signals": [
+                    {
+                        "access": "public",
+                        "arguments": [
+                            {
+                                "name": "i",
+                                "type": "int"
+                            }
+                        ],
+                        "name": "signalWithDefaultArg",
+                        "returnType": "void"
+                    },
+                    {
+                        "access": "public",
+                        "isCloned": true,
+                        "name": "signalWithDefaultArg",
+                        "returnType": "void"
+                    }
+                ],
+                "superClasses": [
+                    {
+                        "access": "public",
+                        "name": "QObject"
+                    }
+                ]
+            }
+        ],
+        "inputFile": "signal-with-default-arg.h",
+        "outputRevision": 68
+    },
     {
         "classes": [
             {
diff --git a/tests/auto/tools/moc/signal-with-default-arg.h b/tests/auto/tools/moc/signal-with-default-arg.h
new file mode 100644
index 00000000000..32933289327
--- /dev/null
+++ b/tests/auto/tools/moc/signal-with-default-arg.h
@@ -0,0 +1,16 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef SIGNAL_WITH_DEFAULT_ARG_H
+#define SIGNAL_WITH_DEFAULT_ARG_H
+
+#include <QtCore/qobject.h>
+
+class SignalWithDefaultArg : public QObject
+{
+    Q_OBJECT
+signals:
+    void signalWithDefaultArg(int i = 12);
+};
+
+#endif // SIGNAL_WITH_DEFAULT_ARG_H
diff --git a/tests/auto/tools/moc/tst_moc.cpp b/tests/auto/tools/moc/tst_moc.cpp
index 3ed8f1a7663..35c31b6b873 100644
--- a/tests/auto/tools/moc/tst_moc.cpp
+++ b/tests/auto/tools/moc/tst_moc.cpp
@@ -56,6 +56,8 @@
 #include "fwdclass2.h"
 #include "fwdclass3.h"
 
+#include "signal-with-default-arg.h"
+
 #include "qmlmacro.h"
 
 #ifdef Q_MOC_RUN
@@ -767,6 +769,7 @@ signals:
     void constSignal2(int arg) const;
     void member4Changed();
     void member5Changed(const QString &newVal);
+    void sigWithDefaultArg(int i = 12);
 
 private:
     bool user1() { return true; };