diff --git a/android/gralloc_handle.h b/android/gralloc_handle.h
index 7cbc8ee7..5d8a19ea 100644
--- a/android/gralloc_handle.h
+++ b/android/gralloc_handle.h
@@ -51,7 +51,7 @@ struct gralloc_handle_t {
 	int prime_fd;
 
 	/* api variables */
-	int magic; /* differentiate between allocator impls */
+	const int magic; /* differentiate between allocator impls */
 	const uint32_t version; /* api version */
 
 	int width; /* width of buffer in pixels */