diff --git a/parser/parser_test.go b/parser/parser_test.go
index 21feb3e573..ebe38a58dd 100644
--- a/parser/parser_test.go
+++ b/parser/parser_test.go
@@ -1296,7 +1296,9 @@ func (s *testParserSuite) TestBuiltin(c *C) {
 		{`select std(c1) from t`, true},
 		{`select stddev(c1) from t`, true},
 		{`select stddev_pop(c1) from t`, true},
-		{`select stddev_pop(distinct c1 from t)`, true},
+		{`select stddev_pop(distinct c1) from t`, true},
+		{`select stddev_samp(c1) from t`, true},
+		{`select stddev_samp(distinct c1) from t`, true},
 
 		// for encryption and compression functions
 		{`select AES_ENCRYPT('text',UNHEX('F3229A0B371ED2D9441B830D21A390C3'))`, true},