diff --git a/src/plugins/qmldesigner/designercore/projectstorage/qmltypesparser.cpp b/src/plugins/qmldesigner/designercore/projectstorage/qmltypesparser.cpp
index 2274d83eb6e..a11a36ba8e2 100644
--- a/src/plugins/qmldesigner/designercore/projectstorage/qmltypesparser.cpp
+++ b/src/plugins/qmldesigner/designercore/projectstorage/qmltypesparser.cpp
@@ -410,18 +410,17 @@ void addType(Storage::Synchronization::Types &types,
     auto exports = exportScope.exports;
 
     auto enumerationTypes = addEnumerationTypes(types, typeName, sourceId, cppModuleId, enumerations);
-    types.emplace_back(Utils::SmallStringView{typeName},
-                       Storage::Synchronization::ImportedType{TypeNameString{component.baseTypeName()}},
-                       Storage::Synchronization::ImportedType{},
-                       createTypeTraits(component.accessSemantics()),
-                       sourceId,
-                       createExports(exports, typeName, storage, cppModuleId),
-                       createProperties(component.ownProperties(),
-                                        enumerationTypes,
-                                        componentNameWithoutNamespace),
-                       std::move(functionsDeclarations),
-                       std::move(signalDeclarations),
-                       createEnumeration(enumerations));
+    types.emplace_back(
+        Utils::SmallStringView{typeName},
+        Storage::Synchronization::ImportedType{TypeNameString{component.baseTypeName()}},
+        Storage::Synchronization::ImportedType{TypeNameString{component.extensionTypeName()}},
+        createTypeTraits(component.accessSemantics()),
+        sourceId,
+        createExports(exports, typeName, storage, cppModuleId),
+        createProperties(component.ownProperties(), enumerationTypes, componentNameWithoutNamespace),
+        std::move(functionsDeclarations),
+        std::move(signalDeclarations),
+        createEnumeration(enumerations));
 }
 
 void addTypes(Storage::Synchronization::Types &types,
diff --git a/tests/unit/unittest/qmltypesparser-test.cpp b/tests/unit/unittest/qmltypesparser-test.cpp
index 8db43fae3b1..30385ffdaec 100644
--- a/tests/unit/unittest/qmltypesparser-test.cpp
+++ b/tests/unit/unittest/qmltypesparser-test.cpp
@@ -39,16 +39,17 @@ MATCHER_P(HasPrototype, prototype, std::string(negation ? "isn't " : "is ") + Pr
 MATCHER_P5(IsType,
            typeName,
            prototype,
-           extensionType,
+           extension,
            traits,
            sourceId,
            std::string(negation ? "isn't " : "is ")
-               + PrintToString(Storage::Type{typeName, prototype, extensionType, traits, sourceId}))
+               + PrintToString(Storage::Type{typeName, prototype, extension, traits, sourceId}))
 {
     const Storage::Type &type = arg;
 
     return type.typeName == typeName && type.prototype == Storage::ImportedTypeName{prototype}
-           && type.traits == traits && type.sourceId == sourceId;
+           && type.extension == Storage::ImportedTypeName{extension} && type.traits == traits
+           && type.sourceId == sourceId;
 }
 
 MATCHER_P3(IsPropertyDeclaration,
@@ -181,6 +182,28 @@ TEST_F(QmlTypesParser, Imports)
 }
 
 TEST_F(QmlTypesParser, Types)
+{
+    QString source{R"(import QtQuick.tooling 1.2
+                      Module{
+                        Component { name: "QObject"}
+                        Component { name: "QQmlComponent"}})"};
+
+    parser.parse(source, imports, types, projectData);
+
+    ASSERT_THAT(types,
+                UnorderedElementsAre(IsType("QObject",
+                                            Storage::ImportedType{},
+                                            Storage::ImportedType{},
+                                            QmlDesigner::Storage::TypeTraits::Reference,
+                                            qmltypesFileSourceId),
+                                     IsType("QQmlComponent",
+                                            Storage::ImportedType{},
+                                            Storage::ImportedType{},
+                                            QmlDesigner::Storage::TypeTraits::Reference,
+                                            qmltypesFileSourceId)));
+}
+
+TEST_F(QmlTypesParser, Prototype)
 {
     QString source{R"(import QtQuick.tooling 1.2
                       Module{
@@ -203,6 +226,29 @@ TEST_F(QmlTypesParser, Types)
                                             qmltypesFileSourceId)));
 }
 
+TEST_F(QmlTypesParser, Extension)
+{
+    QString source{R"(import QtQuick.tooling 1.2
+                      Module{
+                        Component { name: "QObject"}
+                        Component { name: "QQmlComponent"
+                                    extension: "QObject"}})"};
+
+    parser.parse(source, imports, types, projectData);
+
+    ASSERT_THAT(types,
+                UnorderedElementsAre(IsType("QObject",
+                                            Storage::ImportedType{},
+                                            Storage::ImportedType{},
+                                            QmlDesigner::Storage::TypeTraits::Reference,
+                                            qmltypesFileSourceId),
+                                     IsType("QQmlComponent",
+                                            Storage::ImportedType{},
+                                            Storage::ImportedType{"QObject"},
+                                            QmlDesigner::Storage::TypeTraits::Reference,
+                                            qmltypesFileSourceId)));
+}
+
 TEST_F(QmlTypesParser, ExportedTypes)
 {
     QString source{R"(import QtQuick.tooling 1.2