diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 8e71331d56..734e878e05 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -472,7 +472,7 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
                                                          P_("Use font in label"),
                                                          P_("Whether the label is drawn in the selected font"),
                                                          FALSE,
-                                                         GTK_PARAM_READWRITE));
+                                                         GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
 
   /**
    * GtkFontButton:use-size:
@@ -488,7 +488,7 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
                                                          P_("Use size in label"),
                                                          P_("Whether the label is drawn with the selected font size"),
                                                          FALSE,
-                                                         GTK_PARAM_READWRITE));
+                                                         GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
 
   /**
    * GtkFontButton:show-style:
@@ -505,7 +505,7 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
                                                          P_("Show style"),
                                                          P_("Whether the selected font style is shown in the label"),
                                                          TRUE,
-                                                         GTK_PARAM_READWRITE));
+                                                         GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
   /**
    * GtkFontButton:show-size:
    * 
@@ -521,7 +521,7 @@ gtk_font_button_class_init (GtkFontButtonClass *klass)
                                                          P_("Show size"),
                                                          P_("Whether selected font size is shown in the label"),
                                                          TRUE,
-                                                         GTK_PARAM_READWRITE));
+                                                         GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
 
   /**
    * GtkFontButton::font-set: