diff --git a/stdlib/sql.go b/stdlib/sql.go
index cc09a3b3..ca54a1da 100644
--- a/stdlib/sql.go
+++ b/stdlib/sql.go
@@ -197,7 +197,7 @@ func (c *Conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, e
 		pgxOpts.IsoLevel = pgx.ReadUncommitted
 	case sql.LevelReadCommitted:
 		pgxOpts.IsoLevel = pgx.ReadCommitted
-	case sql.LevelSnapshot:
+	case sql.LevelRepeatableRead, sql.LevelSnapshot:
 		pgxOpts.IsoLevel = pgx.RepeatableRead
 	case sql.LevelSerializable:
 		pgxOpts.IsoLevel = pgx.Serializable
diff --git a/stdlib/sql_test.go b/stdlib/sql_test.go
index 06e5d046..5e5039c3 100644
--- a/stdlib/sql_test.go
+++ b/stdlib/sql_test.go
@@ -565,6 +565,7 @@ func TestConnBeginTxIsolation(t *testing.T) {
 		{sqlIso: sql.LevelDefault, pgIso: defaultIsoLevel},
 		{sqlIso: sql.LevelReadUncommitted, pgIso: "read uncommitted"},
 		{sqlIso: sql.LevelReadCommitted, pgIso: "read committed"},
+		{sqlIso: sql.LevelRepeatableRead, pgIso: "repeatable read"},
 		{sqlIso: sql.LevelSnapshot, pgIso: "repeatable read"},
 		{sqlIso: sql.LevelSerializable, pgIso: "serializable"},
 	}