diff --git a/src/cmd/acid/util.c b/src/cmd/acid/util.c
index 3ea3c4c..3e6a313 100644
--- a/src/cmd/acid/util.c
+++ b/src/cmd/acid/util.c
@@ -216,7 +216,8 @@
 		l = mkvar(r->name);
 		v = l->v;
 		v->set = 1;
-		v->store.u.reg = r->name;
+		v->store.u.reg.name = r->name;
+		v->store.u.reg.thread = 0;
 		v->store.fmt = r->format;
 		v->type = TREG;