1 files changed, 1 insertions, 1 deletions
diff --git a/platform.h b/platform.h
index a58d62e..6fdece2 100644
--- a/platform.h
+++ b/platform.h
@@ -90,7 +90,7 @@ class Planner {
         ret = ValidatePlane(plane, layer.second);
         if (!ret)
           break;
-        if (!plane->zpos_property().immutable())
+        if (!plane->zpos_property().is_immutable())
           unused_planes.push_back(plane);
         plane = PopPlane(planes);
       }