diff --git a/libs/ui/FramebufferNativeWindow.cpp b/libs/ui/FramebufferNativeWindow.cpp
index dc223f9..0c820e5 100644
--- a/libs/ui/FramebufferNativeWindow.cpp
+++ b/libs/ui/FramebufferNativeWindow.cpp
@@ -270,10 +270,10 @@
     return res;
 }
 
-int FramebufferNativeWindow::query(ANativeWindow* window,
+int FramebufferNativeWindow::query(const ANativeWindow* window,
         int what, int* value) 
 {
-    FramebufferNativeWindow* self = getSelf(window);
+    const FramebufferNativeWindow* self = getSelf(window);
     Mutex::Autolock _l(self->mutex);
     framebuffer_device_t* fb = self->fbDev;
     switch (what) {