diff --git a/src/tools/moc/moc.cpp b/src/tools/moc/moc.cpp
index b471418a274..d39ee7018a5 100644
--- a/src/tools/moc/moc.cpp
+++ b/src/tools/moc/moc.cpp
@@ -26,6 +26,15 @@ static QByteArray normalizeType(const QByteArray &ba)
     return ba.size() ? normalizeTypeInternal(ba.constBegin(), ba.constEnd()) : ba;
 }
 
+const QByteArray &Moc::toFullyQualified(const QByteArray &name) const noexcept
+{
+    if (auto it = knownQObjectClasses.find(name); it != knownQObjectClasses.end())
+        return it.value();
+    if (auto it = knownGadgets.find(name); it != knownGadgets.end())
+        return it.value();
+    return name;
+}
+
 bool Moc::parseClassHead(ClassDef *def)
 {
     // figure out whether this is a class declaration, or only a
@@ -87,12 +96,12 @@ bool Moc::parseClassHead(ClassDef *def)
             else
                 test(PUBLIC);
             test(VIRTUAL);
-            const QByteArray type = parseType().name;
+            const Type type = parseType();
             // ignore the 'class Foo : BAR(Baz)' case
             if (test(LPAREN)) {
                 until(RPAREN);
             } else {
-                def->superclassList += SuperClass{type, access};
+                def->superclassList.push_back({type.name, toFullyQualified(type.name), access});
             }
         } while (test(COMMA));
 
@@ -2041,6 +2050,8 @@ QJsonObject ClassDef::toJson() const
     for (const auto &super: std::as_const(superclassList)) {
         QJsonObject superCls;
         superCls["name"_L1] = QString::fromUtf8(super.classname);
+        if (super.classname != super.qualified)
+            superCls["fullyQualifiedName"_L1] = QString::fromUtf8(super.qualified);
         FunctionDef::accessToJson(&superCls, super.access);
         superClasses.append(superCls);
     }
diff --git a/src/tools/moc/moc.h b/src/tools/moc/moc.h
index d425351e136..c1759fb0a3e 100644
--- a/src/tools/moc/moc.h
+++ b/src/tools/moc/moc.h
@@ -157,6 +157,7 @@ struct BaseDef {
 
 struct SuperClass {
     QByteArray classname;
+    QByteArray qualified;
     FunctionDef::Access access;
 };
 Q_DECLARE_TYPEINFO(SuperClass, Q_RELOCATABLE_TYPE);
@@ -240,6 +241,8 @@ public:
         return index > def->begin && index < def->end - 1;
     }
 
+    const QByteArray &toFullyQualified(const QByteArray &name) const noexcept;
+
     void prependNamespaces(BaseDef &def, const QList<NamespaceDef> &namespaceList) const;
 
     Type parseType();
diff --git a/tests/auto/tools/moc/CMakeLists.txt b/tests/auto/tools/moc/CMakeLists.txt
index f2a5a1dbe81..1377c48306a 100644
--- a/tests/auto/tools/moc/CMakeLists.txt
+++ b/tests/auto/tools/moc/CMakeLists.txt
@@ -30,6 +30,7 @@ set(JSON_HEADERS
         moc_include.h
         namespace.h
         namespaced-flags.h
+        namespaced-base-class.h
         no-keywords.h
         non-gadget-parent-class.h
         oldstyle-casts.h
diff --git a/tests/auto/tools/moc/allmocs_baseline_in.json b/tests/auto/tools/moc/allmocs_baseline_in.json
index 50dbb200d2d..5cbcb99e68f 100644
--- a/tests/auto/tools/moc/allmocs_baseline_in.json
+++ b/tests/auto/tools/moc/allmocs_baseline_in.json
@@ -1319,6 +1319,35 @@
         "inputFile": "namespace.h",
         "outputRevision": 68
     },
+    {
+        "classes": [
+            {
+                "className": "Base",
+                "object": true,
+                "qualifiedClassName": "QTBUG_101141::Base",
+                "superClasses": [
+                    {
+                        "access": "public",
+                        "name": "QObject"
+                    }
+                ]
+            },
+            {
+                "className": "Derived",
+                "object": true,
+                "qualifiedClassName": "QTBUG_101141::Derived",
+                "superClasses": [
+                    {
+                        "access": "public",
+                        "fullyQualifiedName": "QTBUG_101141::Base",
+                        "name": "Base"
+                    }
+                ]
+            }
+        ],
+        "inputFile": "namespaced-base-class.h",
+        "outputRevision": 68
+    },
     {
         "classes": [
             {
diff --git a/tests/auto/tools/moc/namespaced-base-class.h b/tests/auto/tools/moc/namespaced-base-class.h
new file mode 100644
index 00000000000..6d76db9b542
--- /dev/null
+++ b/tests/auto/tools/moc/namespaced-base-class.h
@@ -0,0 +1,20 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef TST_MOC_NAMESPACED_BASE_CLASS_H
+#define TST_MOC_NAMESPACED_BASE_CLASS_H
+
+#include <QObject>
+
+namespace QTBUG_101141 {
+    class Base : public QObject {
+        Q_OBJECT
+    };
+
+    class Derived : public Base
+    {
+        Q_OBJECT
+    };
+}
+
+#endif // TST_MOC_NAMESPACED_BASE_CLASS_H