diff --git a/include/hardware/gralloc.h b/include/hardware/gralloc.h
index 788815a..84834aa 100644
--- a/include/hardware/gralloc.h
+++ b/include/hardware/gralloc.h
@@ -28,6 +28,8 @@
 
 __BEGIN_DECLS
 
+#define GRALLOC_API_VERSION 1
+
 /**
  * The id of this module
  */
@@ -227,6 +229,7 @@
     int (*free)(struct alloc_device_t* dev,
             buffer_handle_t handle);
 
+    void* reserved_proc[8];
 } alloc_device_t;
 
 
diff --git a/include/hardware/hwcomposer.h b/include/hardware/hwcomposer.h
index fdf2f59..c72d466 100644
--- a/include/hardware/hwcomposer.h
+++ b/include/hardware/hwcomposer.h
@@ -27,6 +27,9 @@
 __BEGIN_DECLS
 
 /*****************************************************************************/
+
+#define HWC_API_VERSION 1
+
 /**
  * The id of this module
  */
@@ -276,6 +279,8 @@
                 hwc_surface_t sur,
                 hwc_layer_list_t* list);
 
+    void* reserved_proc[8];
+
 } hwc_composer_device_t;