In an action to recover damages for breach of contract, plaintiff appeals from an order of the Supreme Court, Suffolk County, dated August 7, 1979, which granted defendant's motion to vacate a default judgment against him. Order reversed, on the law, with $50 costs and disbursements, the motion to vacate the default judgment is denied and the default judgment is reinstated. Special Term erred in allowing this defendant to reopen his default. The court properly found that plaintiff's delay in filing proof of service was a mere procedural irregularity to be corrected by an order nunc pro tunc (see Reporter Co. v. Tomicki, 60 A.D.2d 947). However, Special Term erred in then finding the default judgment to be a nullity because it was entered on the same date that proof of service was filed. Once the filing of proof of service was deemed timely made, service was complete 10 days later (see CPLR 308, subd. 4). Defendant was required to answer within 30 days thereafter (see CPLR 320, subd. [a]). Defendant's time to answer expired some six months prior to entry of the default judgment. Gulotta, J.P., Cohalan, Margett and O'Connor, JJ., concur.