diff --git a/include/ui/GraphicBufferMapper.h b/include/ui/GraphicBufferMapper.h
index 98fff0e..6099548 100644
--- a/include/ui/GraphicBufferMapper.h
+++ b/include/ui/GraphicBufferMapper.h
@@ -41,23 +41,24 @@
     status_t registerBuffer(buffer_handle_t handle);
 
     status_t unregisterBuffer(buffer_handle_t handle);
-    
+
     status_t lock(buffer_handle_t handle,
-            int usage, const Rect& bounds, void** vaddr);
+            uint32_t usage, const Rect& bounds, void** vaddr);
 
     status_t lockYCbCr(buffer_handle_t handle,
-            int usage, const Rect& bounds, android_ycbcr *ycbcr);
+            uint32_t usage, const Rect& bounds, android_ycbcr *ycbcr);
 
     status_t unlock(buffer_handle_t handle);
 
     status_t lockAsync(buffer_handle_t handle,
-            int usage, const Rect& bounds, void** vaddr, int fenceFd);
+            uint32_t usage, const Rect& bounds, void** vaddr, int fenceFd);
 
     status_t lockAsyncYCbCr(buffer_handle_t handle,
-            int usage, const Rect& bounds, android_ycbcr *ycbcr, int fenceFd);
+            uint32_t usage, const Rect& bounds, android_ycbcr *ycbcr,
+            int fenceFd);
 
     status_t unlockAsync(buffer_handle_t handle, int *fenceFd);
-    
+
     // dumps information about the mapping of this handle
     void dump(buffer_handle_t handle);