diff --git a/ui/ops.go b/ui/ops.go
index 598532a5..3bba2e9e 100644
--- a/ui/ops.go
+++ b/ui/ops.go
@@ -94,6 +94,7 @@ func (s *StackOp) Pop() {
 	if d != s.depth {
 		panic("unbalanced pop")
 	}
+	s.active = false
 	s.ops.stackDepth--
 	s.ops.Write([]byte{byte(ops.TypePop)})
 }