diff --git a/src/sna/gen6_render.c b/src/sna/gen6_render.c
index 2b4fd039..6ef26c81 100644
--- a/src/sna/gen6_render.c
+++ b/src/sna/gen6_render.c
@@ -2821,6 +2821,7 @@ fallback_blt:
 		tmp.src.bo = src_bo;
 		tmp.src.width  = src->drawable.width;
 		tmp.src.height = src->drawable.height;
+		tmp.src.offset[0] = tmp.src.offset[1] = 0;
 	}
 
 	tmp.mask.bo = NULL;
diff --git a/src/sna/gen7_render.c b/src/sna/gen7_render.c
index 1999aed5..ce153e54 100644
--- a/src/sna/gen7_render.c
+++ b/src/sna/gen7_render.c
@@ -3056,6 +3056,7 @@ fallback_blt:
 		tmp.src.bo = src_bo;
 		tmp.src.width  = src->drawable.width;
 		tmp.src.height = src->drawable.height;
+		tmp.src.offset[0] = tmp.src.offset[1] = 0;
 	}
 
 	tmp.mask.bo = NULL;
diff --git a/src/sna/gen8_render.c b/src/sna/gen8_render.c
index f3ccb9b7..53bac819 100644
--- a/src/sna/gen8_render.c
+++ b/src/sna/gen8_render.c
@@ -2880,6 +2880,7 @@ fallback_blt:
 		tmp.src.bo = src_bo;
 		tmp.src.width  = src->drawable.width;
 		tmp.src.height = src->drawable.height;
+		tmp.src.offset[0] = tmp.src.offset[1] = 0;
 	}
 
 	tmp.mask.bo = NULL;