diff --git a/src/gallium/frontends/xa/xa_tracker.c b/src/gallium/frontends/xa/xa_tracker.c
index 31162606375..c802a40edb4 100644
--- a/src/gallium/frontends/xa/xa_tracker.c
+++ b/src/gallium/frontends/xa/xa_tracker.c
@@ -155,7 +155,7 @@ xa_get_pipe_format(struct xa_tracker *xa, enum xa_formats xa_format)
             fdesc.format = PIPE_FORMAT_L8_UNORM;
 	break;
     default:
-	fdesc.xa_format = xa_format_unknown;
+	unreachable("Unexpected format");
 	break;
     }
     return fdesc;