diff --git a/src/lib/navigation/completer/locationcompleterdelegate.h b/src/lib/navigation/completer/locationcompleterdelegate.h
--- a/src/lib/navigation/completer/locationcompleterdelegate.h
+++ b/src/lib/navigation/completer/locationcompleterdelegate.h
@@ -24,6 +24,7 @@
 
 class FALKON_EXPORT LocationCompleterDelegate : public QStyledItemDelegate
 {
+    Q_OBJECT
 public:
     explicit LocationCompleterDelegate(QObject *parent = 0);
 
diff --git a/src/plugins/FlashCookieManager/fcm_plugin.cpp b/src/plugins/FlashCookieManager/fcm_plugin.cpp
--- a/src/plugins/FlashCookieManager/fcm_plugin.cpp
+++ b/src/plugins/FlashCookieManager/fcm_plugin.cpp
@@ -43,6 +43,7 @@
 
 class FCM_Button : public AbstractButtonInterface
 {
+    Q_OBJECT
 public:
     explicit FCM_Button(QObject *parent = nullptr)
         : AbstractButtonInterface(parent)
@@ -462,3 +463,5 @@
 
     return origin;
 }
+
+#include "fcm_plugin.moc"
diff --git a/src/plugins/TabManager/tabmanagerwidgetcontroller.cpp b/src/plugins/TabManager/tabmanagerwidgetcontroller.cpp
--- a/src/plugins/TabManager/tabmanagerwidgetcontroller.cpp
+++ b/src/plugins/TabManager/tabmanagerwidgetcontroller.cpp
@@ -34,6 +34,7 @@
 
 class TabManagerButton : public AbstractButtonInterface
 {
+    Q_OBJECT
 public:
     explicit TabManagerButton(QObject *parent = nullptr)
         : AbstractButtonInterface(parent)
@@ -236,3 +237,5 @@
 {
     emit requestRefreshTree();
 }
+
+#include "tabmanagerwidgetcontroller.moc"
diff --git a/src/plugins/VerticalTabs/verticaltabsschemehandler.h b/src/plugins/VerticalTabs/verticaltabsschemehandler.h
--- a/src/plugins/VerticalTabs/verticaltabsschemehandler.h
+++ b/src/plugins/VerticalTabs/verticaltabsschemehandler.h
@@ -21,6 +21,7 @@
 
 class VerticalTabsSchemeHandler : public ExtensionSchemeHandler
 {
+    Q_OBJECT
 public:
     explicit VerticalTabsSchemeHandler(QObject *parent = nullptr);