diff --git a/gtk/gtkallocatedbitmask.c b/gtk/gtkallocatedbitmask.c
index 6f0f1f8616..567b86cb91 100644
--- a/gtk/gtkallocatedbitmask.c
+++ b/gtk/gtkallocatedbitmask.c
@@ -174,11 +174,14 @@ _gtk_allocated_bitmask_intersect (GtkBitmask       *mask,
   mask = gtk_bitmask_ensure_allocated (mask);
   ENSURE_ALLOCATED (other, other_allocated);
 
-  mask = gtk_allocated_bitmask_resize (mask, MIN (mask->len, other->len));
-  for (i = 0; i < mask->len; i++)
+  for (i = 0; i < MIN (mask->len, other->len); i++)
     {
       mask->data[i] &= other->data[i];
     }
+  for (; i < mask->len; i++)
+    {
+      mask->data[i] = 0;
+    }
 
   return gtk_allocated_bitmask_shrink (mask);
 }