The threshold question presented is whether the successful bidder for a government road construction contract is entitled to reformation of the contract to increase the price by $317,463 based on a unilateral mistake, after the competing bids are all opened, where the new contract price would still be lower than the second lowest bid.
The Department of Transportation (DOT) solicited bids pursuant to section 337.11, *1327Florida Statutes (1985), for the construction of an interchange at the intersection of State Road 826 and Interstate 75 in Hialeah. On December 7, 1983, DOT declared Ronlee, Inc. the apparent low bidder with a bid of $15,799,197.90. The second lowest bid exceeded Ronlee’s bid by $610,148.1
On February 13, 1984, DOT entered into a contract with Ronlee to construct the project based on the bid, and on March 7, 1984, gave Ronlee notice to proceed with the project. Five days later, Ronlee advised DOT that the bid contained a “stupid mistake” in the amount of $317,463. The letter alleged an error with respect to the unit bid price for concrete culverts which occurred when an employee of Ronlee erroneously transcribed a phone quote of $525 for each culvert as $5.25 each. By letter dated March 21, 1984, DOT informed Ron-lee that it was aware of the apparently unbalanced unit price for the concrete culverts, but that it was unable, as a matter of state policy, to permit.an increase in the contract price.
Nevertheless, on March 22, 1984, having made no effort to withdraw the bid, Ronlee began construction of the project. Twenty-one months later, with the project seventy-five percent completed, Ronlee filed suit against DOT seeking reformation of the contract. Both sides moved for summary judgment, agreeing that the material facts were not in dispute. Ronlee’s motion for summary judgment was granted, the trial court holding that DOT’s silence about Ronlee’s apparent error in price calculations constituted inequitable conduct and that reformation of the contract would not undermine the competitive bidding process. In addition to the $317,463, the court awarded Ronlee $60,000 in prejudgment interest and costs. We reverse.
Where a contractor makes a unilateral error in formulating his bid for a public contract, the remedy is rescission of the contract. Jones, The Law of Mistaken Bids, 48 U.Cin.L.Rev. 43, 49 (1979); Annotation, Right of Bidder for State or Municipal Contract to Rescind Bid on Ground that Bid was Based Upon His Own Mistake or that of His Employee, 2 A.L.R. 4th 991 (1980). Florida courts have permitted a contractor to withdraw a bid on a public contract, subject to certain equitable conditions. In State Board of Control v. Clutter Construction Corp., 139 So.2d 153 (Fla. 1st DCA), cert. denied, 146 So.2d 374 (Fla.1962), a contractor was permitted to withdraw a bid on a showing of the following equitable factors: (1) the bidder acted in good faith in submitting the bid; (2) in preparing the bid there was an error of such magnitude that enforcement of the bid would work severe hardship upon the bidder; (3) the error was not a result of gross negligence or willful inattention; (4) the error was discovered and communicated to the public body, along with a request for permission to withdraw the bid, before acceptance.
No reported Florida decision has permitted reformation by belated request of a bid contract for a public project in order to make it profitable to the contractor.2 Graham v. Clyde, 61 So.2d 656 (Fla.1952), is the only case presented by the parties where reformation was even sought as relief for a mistaken bid. There a building contractor was low bidder on a proposal to construct a public school building and was *1328awarded the contract. The following day he notified public officials that he had made a mistake of $5,000 in computing items in his bid and asked to be relieved of his obligation to perform according to the contract terms. He offered to perform the contract for $5,000 more, which was still less than the next low bidder. The circuit court did not grant a reformation but did rescind the contract and enjoined the school board from attempting to enforce it.
The Florida Supreme Court, citing a number of cases from other jurisdictions, reversed, holding that unilateral errors are not generally relieved and that there was no equitable basis for relief. In an opinion by Justice Terrell the court stated the reason for the firm rule:
If errors of this nature can be relieved in equity, our system of competitive bidding on such contracts would in effect be placed in jeopardy and there would be no stability whatever to it. It would encourage careless, slipshod bidding in some cases and would afford a pretext for the dishonest bidder to prey on the public.... After the bid is accepted, the bidder is bound by his error and is expected to bear the consequence of it.
61 So.2d at 658.
The prevailing view is that reformation is not the appropriate form of relief for unilateral mistakes in public contract bids where the bidder is negligent. Dale Ingram, Inc. v. United States, 475 F.2d 1177, 201 Ct.Cl. 56 (1973); Blue Water Excavating Co. v. State, 4 Mich.App. 266, 144 N.W.2d 630 (1966); Baltimore v. De Luca-Davis Constr. Co., 210 Md. 518, 124 A.2d 557 (1956).3 The reason for not permitting reformation of bid contracts for public projects based on unilateral mistake is the same in other jurisdictions — to prevent collusive schemes between bidders, or between bidders and awarding officials, or multiple claims from contractors asserting mistake and claiming inequity at taxpayers’ expense. See Heating Maintenance Cory, v. City of New York, 129 N.Y.S.2d 466 (N.Y.Sup.Ct.1954); Paterson v. Board of Trustees, 157 Cal.App.2d 811, 321 P.2d 825 (1958).
A written instrument may be reformed where it fails to express the intention of the parties as a result of mutual mistake, or unilateral mistake accompanied by inequitable conduct by the other party. Camichos v. Diana Stores Cory., 157 Fla. 349, 25 So.2d 864 (1946). Because the mistake in this instance was admittedly unilateral, in order to obtain reformation of the contract, Ronlee was obligated to show by clear and convincing evidence that DOT’s conduct in not calling Ronlee’s attention to a possible error in the bid tabulations was fraudulent or otherwise inequitable. Robinson v. Wright, 425 So.2d 589 (Fla. 3d DCA 1982). That burden was not carried. The Department’s failure to call Ronlee’s attention to the error in calculation was of no consequence since Ronlee discovered its own error shortly after the Department learned of the miscalculation.
Competitive bidding statutes are enacted to protect the public and should be con*1329strued to avoid circumvention. Wester v. Belote, 103 Fla. 976, 138 So. 721 (1931); Miami Marinas Ass’n Inc. v. City of Miami, 408 So.2d 615 (Fla. 3d DCA 1981), rev. denied, 418 So.2d 1278 (Fla.1982). A government unit is not required to act for the protection of a contractor’s interest; it is entitled to the bargain obtained in accepting the lowest responsible bid and is under no obligation to examine bids to ascertain errors and to inform bidders accordingly. Blue Water Excavating Co. v. State, 144 N.W.2d at 634, (citing Heating Maintenance Corp. v. City of New York). Absent an obligation to do so, failure of the government in this case to call the bidder's attention to a relatively minor two percent error in its calculations, after the bids were opened, was not such fraud or imposition as would entitle the bidder to reformation of the contract.
Further, Ronlee forfeited any right it may have had to reformation or rescission. It had knowledge of its own mistake at least ten days before commencement of construction. Ronlee’s conduct in performing according to the terms of the agreement for twenty-one months instead of seeking to withdraw the bid, after DOT had advised that it could not administratively correct the error, effected a waiver of rights. See Farnham v. Blount, 152 Fla. 208, 11 So.2d 785 (Fla.1942) (any unreasonable or unnecessary delay by a party seeking to cancel an instrument based on fraud or other sufficient cause will be construed as a waiver or ratification); Thompson v. Gross, 353 So.2d 191 (Fla. 3d DCA 1977); Malt v. Deese, 399 So.2d 41 (Fla. 4th DCA 1981). See generally 9 Fla.Jur.2d Cancellation, Reformation and Rescission of Instruments, §§ 37, 38 (1979).
Reversed and remanded with instructions to enter judgment for the Department of Transportation.
HENDRY and FERGUSON, JJ., concur.