diff --git a/src/V3AstNodeExpr.h b/src/V3AstNodeExpr.h
index bd54322c2..0216bbb3e 100644
--- a/src/V3AstNodeExpr.h
+++ b/src/V3AstNodeExpr.h
@@ -1106,7 +1106,7 @@ public:
     // METHODS
     string emitVerilog() override { V3ERROR_NA_RETURN(""); }
     string emitC() override { V3ERROR_NA_RETURN(""); }
-    bool cleanOut() const override { return false; }
+    bool cleanOut() const override { return true; }
     bool same(const AstNode*) const override { return true; }
 };
 class AstFError final : public AstNodeExpr {