diff --git a/widgets/combobox.h b/widgets/combobox.h
index 40be571f8..142b587de 100644
--- a/widgets/combobox.h
+++ b/widgets/combobox.h
@@ -146,6 +146,7 @@ private:
 
     friend class ComboBoxPrivate;
     Q_PRIVATE_SLOT(d, void syncBorders())
+    Q_PRIVATE_SLOT(d, void setPalette())
 };
 
 } // namespace Plasma
diff --git a/widgets/frame.h b/widgets/frame.h
index fe908f0e0..be1b1eed1 100644
--- a/widgets/frame.h
+++ b/widgets/frame.h
@@ -144,6 +144,7 @@ private:
     FramePrivate * const d;
 
     Q_PRIVATE_SLOT(d, void syncBorders())
+    Q_PRIVATE_SLOT(d, void setPalette())
 };
 
 } // namespace Plasma
diff --git a/widgets/iconwidget.h b/widgets/iconwidget.h
index 34ba107d7..7a4c298a5 100644
--- a/widgets/iconwidget.h
+++ b/widgets/iconwidget.h
@@ -383,6 +383,7 @@ private:
     Q_PRIVATE_SLOT(d, void hoverAnimationFinished())
     Q_PRIVATE_SLOT(d, void colorConfigChanged())
     Q_PRIVATE_SLOT(d, void iconConfigChanged())
+    Q_PRIVATE_SLOT(d, void setPalette())
 
     IconWidgetPrivate * const d;
     friend class IconWidgetPrivate;
diff --git a/widgets/pushbutton.h b/widgets/pushbutton.h
index 78d38abe2..1a658515c 100644
--- a/widgets/pushbutton.h
+++ b/widgets/pushbutton.h
@@ -231,6 +231,7 @@ private:
     Q_PRIVATE_SLOT(d, void setPixmap())
     Q_PRIVATE_SLOT(d, void pressedChanged())
     Q_PRIVATE_SLOT(d, void syncToAction())
+    Q_PRIVATE_SLOT(d, void setPalette())
 
     friend class PushButtonPrivate;
     PushButtonPrivate *const d;
diff --git a/widgets/toolbutton.h b/widgets/toolbutton.h
index 6271f820a..77f48dc81 100644
--- a/widgets/toolbutton.h
+++ b/widgets/toolbutton.h
@@ -195,6 +195,7 @@ private:
     Q_PRIVATE_SLOT(d, void syncToAction())
     Q_PRIVATE_SLOT(d, void clearAction())
     Q_PRIVATE_SLOT(d, void setPixmap())
+    Q_PRIVATE_SLOT(d, void setPalette())
 
     friend class ToolButtonPrivate;
     ToolButtonPrivate *const d;