diff --git a/src/nv10_exa.c b/src/nv10_exa.c
index cb9eb7c..bf5e7d6 100644
--- a/src/nv10_exa.c
+++ b/src/nv10_exa.c
@@ -504,7 +504,7 @@ setup_picture(NVPtr pNv, PicturePtr pict, PixmapPtr pixmap, int unit,
 	      uint32_t *color, uint32_t *alpha)
 {
 	struct nouveau_pushbuf *push = pNv->pushbuf;
-	uint32_t shift, source;
+	uint32_t shift, source = 0;
 
 	if (pict && pict->pDrawable) {
 		if (!setup_texture(pNv, unit, pict, pixmap))