diff --git a/src/gallium/winsys/r600/drm/r600_hw_context.c b/src/gallium/winsys/r600/drm/r600_hw_context.c
index fa005379b53..2521ff96473 100644
--- a/src/gallium/winsys/r600/drm/r600_hw_context.c
+++ b/src/gallium/winsys/r600/drm/r600_hw_context.c
@@ -968,7 +968,8 @@ void r600_context_draw(struct r600_context *ctx, const struct r600_draw *draw)
 	struct r600_bo *cb[8];
 	struct r600_bo *db;
 	unsigned ndwords = 9;
-	struct r600_block *dirty_block, *next_block;
+	struct r600_block *dirty_block = NULL;
+	struct r600_block *next_block;
 
 	if (draw->indices) {
 		ndwords = 13;