diff --git a/src/Functions/DummyJSONParser.h b/src/Functions/DummyJSONParser.h
index 21b4ebef150..e74ab57ded1 100644
--- a/src/Functions/DummyJSONParser.h
+++ b/src/Functions/DummyJSONParser.h
@@ -41,7 +41,7 @@ struct DummyJSONParser
         Object getObject() const { return {}; }
 
         Element getElement() { return {}; }
-        std::ostream & operator<<(std::ostream & os) { return os; }
+        std::ostream & operator<<(std::ostream & os) const { return os; }
     };
 
     /// References an array in a JSON document.
@@ -100,4 +100,9 @@ struct DummyJSONParser
 #endif
 };
 
+ALWAYS_INLINE std::ostream& operator<<(std::ostream& out, DummyJSONParser::Element)
+{
+    return out;
+}
+
 }