diff --git a/src/sna/gen6_render.c b/src/sna/gen6_render.c
index 08c9f785..aadc6f7d 100644
--- a/src/sna/gen6_render.c
+++ b/src/sna/gen6_render.c
@@ -1831,6 +1831,8 @@ gen6_composite_set_target(struct sna *sna,
 	BoxRec box;
 	unsigned int hint;
 
+	DBG(("%s: (%d, %d)x(%d, %d), partial?=%d\n", __FUNCTION__, x, y, w, h));
+
 	op->dst.pixmap = get_drawable_pixmap(dst->pDrawable);
 	op->dst.format = dst->format;
 	op->dst.width = op->dst.pixmap->drawable.width;
diff --git a/src/sna/gen7_render.c b/src/sna/gen7_render.c
index 1574813a..a90bd15a 100644
--- a/src/sna/gen7_render.c
+++ b/src/sna/gen7_render.c
@@ -2111,6 +2111,8 @@ gen7_composite_set_target(struct sna *sna,
 	BoxRec box;
 	unsigned int hint;
 
+	DBG(("%s: (%d, %d)x(%d, %d), partial?=%d\n", __FUNCTION__, x, y, w, h));
+
 	op->dst.pixmap = get_drawable_pixmap(dst->pDrawable);
 	op->dst.format = dst->format;
 	op->dst.width  = op->dst.pixmap->drawable.width;
diff --git a/src/sna/gen8_render.c b/src/sna/gen8_render.c
index 5c718bc5..c096db1f 100644
--- a/src/sna/gen8_render.c
+++ b/src/sna/gen8_render.c
@@ -1862,6 +1862,8 @@ gen8_composite_set_target(struct sna *sna,
 	BoxRec box;
 	unsigned int hint;
 
+	DBG(("%s: (%d, %d)x(%d, %d), partial?=%d\n", __FUNCTION__, x, y, w, h));
+
 	op->dst.pixmap = get_drawable_pixmap(dst->pDrawable);
 	op->dst.format = dst->format;
 	op->dst.width  = op->dst.pixmap->drawable.width;