Souris, J.

Plaintiff’s airplane was damaged when a hangar door fell upon it as defendants’ employees were removing it, at plaintiff’s request, from a hangar located upon an airport operated by defendants. Attempts to reach a settlement having failed, plaintiff filed a statement of claim with the court of claims in accordance with the provisions of CL 1948, § 691.101 et seq. (Stat Ann 1959 Cum Supp § 27.3548 [1] et seq.). * That court granted defendants’ motion to dismiss, reasoning that in accordance with recent decisions of this Court (McDowell v. State Highway Commissioner, 365 Mich 268, and Sayers v. School District, No. 1, Fractional, 366 Mich 217) a State agency could, as defendants did in their motion, avail itself of the defense of governmental immunity to a cause of action in tort. The court held further that nothing could be found in plaintiff’s statement of claim which could be taken to allege a Contractual cause of action, and, in any event, defendants’ operation of the airport was not a proprietary function from which either contractual or tort liability could be imposed upon defendants.

Plaintiff’s claim alleged that defendants had contracted to lease the hangar to him and to provide certain services, including moving the aircraft into and out of the hangar, and that while defendants’ *287 employees were in the performance of this agreement, the aircraft had been damaged. Included in an attached memorandum agreement is a statement that the defendant department of aeronautics would not “assume any liability for loss due to fire or theft within the hangar.” Plaintiff’s allegations adequately pleaded the issue of defendants’ breach of a contractual obligation to service the aircraft without damaging it, the existence of which obligation is at least inferable from the specific disclaimer of liability only with respect to loss incurred as a result of fire or theft. Expressio unius est exclusio alterius. 3 Corbin, Contracts, § 552, p 206, and cases there cited.

The assumption indulged by the court of claims in Its opinion and by the attorney general in his brief on behalf of defendants, namely, that unless the .State is engaged in a proprietary function it may assert the defense of governmental immunity to a claim for contractual as well as for tort liability, is incorrect. W. H. Knapp Co. v. State Highway Department, 311 Mich 186, 188; Hersey Gravel Co. v. State Highway Department, 305 Mich 333, 339 (173 ALR 302).

Inasmuch as governmental immunity is not a defense to a claim against the State for contractual liability arising out of either governmental or proprietary operations, and since plaintiff adequately pleaded such a claim, the court of claims erred in granting defendants’ motion to dismiss. Reversed and remanded. Costs to appellant.

Kavanagh, C. J., and Dethmers, Kelly, Black, ' Smith, and O’Hara, JJ., concurred. Adams, J., took no part in the decision of this case.

Currently PA 1961, No 236, chapter 64 (CLS 1961, § 600.6401 et seq. [Stat Ann 1962 Rev § 27A.6401 et seq.}).