diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 39dffcf603..0c17ac01ae 100644
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -731,14 +731,16 @@ static guint signals[LAST_SIGNAL] = { 0 };
 
 enum {
   PROP_0,
-  PROP_ORIENTATION,
   PROP_HOMOGENEOUS,
   PROP_COLUMN_SPACING,
   PROP_ROW_SPACING,
   PROP_MIN_CHILDREN_PER_LINE,
   PROP_MAX_CHILDREN_PER_LINE,
   PROP_SELECTION_MODE,
-  PROP_ACTIVATE_ON_SINGLE_CLICK
+  PROP_ACTIVATE_ON_SINGLE_CLICK,
+
+  /* orientable */
+  PROP_ORIENTATION
 };
 
 typedef struct _GtkFlowBoxPrivate GtkFlowBoxPrivate;