diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 9c2b5a1644..28e6345271 100644
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -3665,7 +3665,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                        P_("The selection mode"),
                        GTK_TYPE_SELECTION_MODE,
                        GTK_SELECTION_SINGLE,
-                       G_PARAM_READWRITE);
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:activate-on-single-click:
@@ -3678,7 +3678,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                           P_("Activate on Single Click"),
                           P_("Activate row on a single click"),
                           TRUE,
-                          G_PARAM_READWRITE);
+                          G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:homogeneous:
@@ -3691,7 +3691,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                           P_("Homogeneous"),
                           P_("Whether the children should all be the same size"),
                           FALSE,
-                          G_PARAM_READWRITE);
+                          G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:min-children-per-line:
@@ -3709,7 +3709,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                        P_("The minimum number of children to allocate "
                        "consecutively in the given orientation."),
                        0, G_MAXUINT, 0,
-                       G_PARAM_READWRITE);
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:max-children-per-line:
@@ -3723,7 +3723,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                        P_("The maximum amount of children to request space for "
                           "consecutively in the given orientation."),
                        0, G_MAXUINT, DEFAULT_MAX_CHILDREN_PER_LINE,
-                       G_PARAM_READWRITE);
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:row-spacing:
@@ -3735,7 +3735,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                        P_("Vertical spacing"),
                        P_("The amount of vertical space between two children"),
                        0, G_MAXUINT, 0,
-                       G_PARAM_READWRITE);
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   /**
    * GtkFlowBox:column-spacing:
@@ -3747,7 +3747,7 @@ gtk_flow_box_class_init (GtkFlowBoxClass *class)
                        P_("Horizontal spacing"),
                        P_("The amount of horizontal space between two children"),
                        0, G_MAXUINT, 0,
-                       G_PARAM_READWRITE);
+                       G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
 
   g_object_class_install_properties (object_class, LAST_PROP, props);