diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index ec49884c8f..9d0d336ae6 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -71,7 +71,7 @@ typedef enum {
   POSITION_ONLY,
   POSITION_SORTED
 } PositionType;
-#define POSITION_TYPE_BITS 2
+#define POSITION_TYPE_BITS 4
 #define POSITION_NUMBER_BITS ((sizeof (gpointer) * 8 - POSITION_TYPE_BITS) / 2)
 
 union _GtkCssSelector