On 24 February 1849 he was appointed Foreign Minister of Prussia, but resigned from this post already on 3 May, as he did not agree with the German policy of the foreign ministry.
Am 24. Februar 1849 zum Minister des Auswärtigen ernannt, trat er bereits am 3. Mai von dieser Stelle zurück, da er mit der damaligen deutschen Politik des Ministeriums nicht einverstanden war.