אורח חיים רי״דOrach Chayim 214

Se’if 1א׳

כָּל בְּרָכָה שֶׁאֵין בָּהּ הַזְכָּרַת שֵׁם וּמַלְכוּת, אֵינָהּ בְּרָכָה; וְאִם דִּלֵּג שֵׁם אוֹ מַלְכוּת, יַחֲזֹר וִיבָרֵךְ; וַאֲפִלּוּ לֹא דִּלֵּג אֶלָּא תֵּבַת הָעוֹלָם, לְבַד, צָרִיךְ לַחֲזֹר וּלְבָרֵךְ, דְּמֶלֶךְ לְבַד אֵינָהּ מַלְכוּת.

Any beracha that does not include a mention of Hashem’s Name and Kingdom is not a beracha. If the mention of Hashem’s Name or Kingdom were left out the beracha must be repeated. Even if only the word Olam was left out he must repeat the beracha since the word Melech by itself is not an expression of His Kingdom.