diff --git a/src/akonadi/akonadistorage.cpp b/src/akonadi/akonadistorage.cpp
--- a/src/akonadi/akonadistorage.cpp
+++ b/src/akonadi/akonadistorage.cpp
@@ -56,6 +56,7 @@
 
 class CollectionJob : public CollectionFetchJob, public CollectionFetchJobInterface
 {
+    Q_OBJECT
 public:
     CollectionJob(const Collection &collection, Type type = FirstLevel, QObject *parent = Q_NULLPTR)
         : CollectionFetchJob(collection, type, parent),
@@ -131,6 +132,7 @@
 
 class CollectionSearchJob : public CollectionFetchJob, public CollectionSearchJobInterface
 {
+    Q_OBJECT
 public:
     CollectionSearchJob(const QString &collectionName, QObject *parent = Q_NULLPTR)
         : CollectionFetchJob(Akonadi::Collection::root(),
@@ -192,6 +194,7 @@
 
 class ItemJob : public ItemFetchJob, public ItemFetchJobInterface
 {
+    Q_OBJECT
 public:
     using ItemFetchJob::ItemFetchJob;
 
@@ -205,6 +208,7 @@
 
 class TagJob : public TagFetchJob, public TagFetchJobInterface
 {
+    Q_OBJECT
 public:
     using TagFetchJob::TagFetchJob;
 
@@ -399,3 +403,5 @@
     scope.setAncestorRetrieval(ItemFetchScope::All);
     job->setFetchScope(scope);
 }
+
+#include "akonadistorage.moc"
diff --git a/src/widgets/newprojectdialog.cpp b/src/widgets/newprojectdialog.cpp
--- a/src/widgets/newprojectdialog.cpp
+++ b/src/widgets/newprojectdialog.cpp
@@ -36,6 +36,7 @@
 
 class TaskSourceProxy : public QSortFilterProxyModel
 {
+    Q_OBJECT
 public:
     explicit TaskSourceProxy(QObject *parent = Q_NULLPTR)
         : QSortFilterProxyModel(parent)
@@ -116,3 +117,5 @@
     auto buttonOk = ui->buttonBox->button(QDialogButtonBox::Ok);
     buttonOk->setEnabled(!text.isEmpty());
 }
+
+#include "newprojectdialog.moc"
diff --git a/src/widgets/pageview.cpp b/src/widgets/pageview.cpp
--- a/src/widgets/pageview.cpp
+++ b/src/widgets/pageview.cpp
@@ -47,6 +47,7 @@
 namespace Widgets {
 class PageTreeView : public QTreeView
 {
+    Q_OBJECT
 public:
     using QTreeView::QTreeView;
 
@@ -64,6 +65,7 @@
 
 class PassivePopup : public QFrame
 {
+    Q_OBJECT
 public:
     explicit PassivePopup(QWidget *parent = Q_NULLPTR)
         : QFrame(parent),
@@ -359,3 +361,5 @@
 
     return false;
 }
+
+#include "pageview.moc"
diff --git a/tests/units/widgets/applicationcomponentstest.cpp b/tests/units/widgets/applicationcomponentstest.cpp
--- a/tests/units/widgets/applicationcomponentstest.cpp
+++ b/tests/units/widgets/applicationcomponentstest.cpp
@@ -50,6 +50,8 @@
 
 class CustomModelStub : public QStandardItemModel
 {
+    Q_OBJECT
+
     QMimeData *mimeData(const QModelIndexList &indexes) const
     {
         QStringList dataString;