diff --git a/sys/dev/drm/radeon/si_dma.c b/sys/dev/drm/radeon/si_dma.c
@@ -237,7 +237,8 @@
 	struct radeon_sync sync;
 	int ring_index = rdev->asic->copy.dma_ring_index;
 	struct radeon_ring *ring = &rdev->ring[ring_index];
-	u32 size_in_bytes, cur_size_in_bytes;
+	u64 size_in_bytes;
+	u32 cur_size_in_bytes;
 	int i, num_loops;
 	int r = 0;