diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index c08c06373a9..de5732622fe 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -3240,12 +3240,7 @@ transformJsonValueExpr(ParseState *pstate, const char *constructName,
 					parser_errposition(pstate, ve->format->location));
 
 		if (exprtype == JSONOID || exprtype == JSONBOID)
-		{
 			format = JS_FORMAT_DEFAULT; /* do not format json[b] types */
-			ereport(WARNING,
-					errmsg("FORMAT JSON has no effect for json and jsonb types"),
-					parser_errposition(pstate, ve->format->location));
-		}
 		else
 			format = ve->format->format_type;
 	}
diff --git a/src/test/regress/expected/sqljson.out b/src/test/regress/expected/sqljson.out
index 11ebf4403b0..fa2abdb4a7f 100644
--- a/src/test/regress/expected/sqljson.out
+++ b/src/test/regress/expected/sqljson.out
@@ -84,9 +84,6 @@ ERROR:  JSON ENCODING clause is only allowed for bytea input type
 LINE 1: SELECT JSON_OBJECT('foo': NULL::int FORMAT JSON ENCODING UTF...
                                             ^
 SELECT JSON_OBJECT('foo': NULL::json FORMAT JSON);
-WARNING:  FORMAT JSON has no effect for json and jsonb types
-LINE 1: SELECT JSON_OBJECT('foo': NULL::json FORMAT JSON);
-                                             ^
   json_object   
 ----------------
  {"foo" : null}
@@ -97,9 +94,6 @@ ERROR:  JSON ENCODING clause is only allowed for bytea input type
 LINE 1: SELECT JSON_OBJECT('foo': NULL::json FORMAT JSON ENCODING UT...
                                              ^
 SELECT JSON_OBJECT('foo': NULL::jsonb FORMAT JSON);
-WARNING:  FORMAT JSON has no effect for json and jsonb types
-LINE 1: SELECT JSON_OBJECT('foo': NULL::jsonb FORMAT JSON);
-                                              ^
   json_object  
 ---------------
  {"foo": null}