*1243Defendant Jason Alan Holzmann was convicted of stalking ( Pen. Code, § 646.9, subd. (a) ) and granted probation. He contends that one of the conditions of his probation-an order that he stay away from the Apple Computer campus in Cupertino-is unconstitutionally vague because it does not specify a distance. As we will explain, a probation condition ordering someone to stay away from a particular location need only express the obligation it imposes in ordinary and understandable terms. The Constitution does not require more. We will affirm the probation order.
I. BACKGROUND
Defendant pleaded no contest to stalking his ex-wife in violation of Penal Code section 646.9, subdivision (a). As part of a negotiated disposition, the District Attorney agreed to dismiss several misdemeanor charges involving a trespass on the Apple campus in Cupertino in exchange for defendant's no contest plea to the stalking charge. Defendant was granted probation for a period of five years. One of the conditions of probation imposed by *411the trial court is that defendant "stay away from the Apple campus."1 *1244II. DISCUSSION
Defendant contends that the probation condition ordering him to "stay away" from the Apple campus is too vague to provide adequate notice of what he is required to do and therefore violates the United States Constitution. The Attorney General concedes the point based on People v. Barajas (2011) 198 Cal.App.4th 748, 754, 131 Cal.Rptr.3d 412, a decision from a different panel of this court. The Attorney General interprets Barajas as holding that a stay away order without a distance is unconstitutionally vague and must be modified to indicate how close to a specified location a defendant may come (e.g., "defendant must not come within 50 yards of the Apple campus"). We do not accept the concession because Barajas does not compel the conclusion that a stay away order must specify a distance to be constitutional. The addition of an express distance in Barajas was merely one approach to addressing the concern in that case, namely that the phrase "adjacent to" as used in a condition prohibiting the defendant from being "adjacent to any school campus," was vague. ( Id. at p. 760, 131 Cal.Rptr.3d 412.) That language is not an issue here.2 In our view, the condition in this case-requiring defendant to simply "stay away" from a particular place-is not vague.
We review constitutional challenges to probation conditions de novo. ( In re Shaun R. (2010) 188 Cal.App.4th 1129, 1143, 116 Cal.Rptr.3d 84.) Probation conditions, like statutes, are unconstitutional if they are not sufficiently precise for the probationer to know what is required of him or her.
*1245People v. Lopez (1998) 66 Cal.App.4th 615, 630, 78 Cal.Rptr.2d 66.) That is because of the due process requirement *412of fair warning, which is embodied in both the federal and state constitutions. ( In re Sheena K. (2007) 40 Cal.4th 875, 890, 55 Cal.Rptr.3d 716, 153 P.3d 282.) If a law does not provide fair warning of what it prohibits or requires, those to whom it applies will not know what conduct subjects them to punishment. ( Ibid . ) Further, a vague law invites arbitrary and discriminatory enforcement. ( Ibid . ) In McBoyle v. United States (1931) 283 U.S. 25, 51 S.Ct. 340, 75 L.Ed. 816, Justice Holmes explained that vague statutes are prohibited because "a fair warning should be given to the world in language that the common world will understand, of what the law intends to do if a certain line is passed. To make the warning fair, so far as possible the line should be clear." ( Id. at p. 27, 51 S.Ct. 340.) The vagueness challenge here requires us to decide whether an order that defendant "stay away" from a specified location establishes a limitation clear enough to be constitutional.
Our analysis must recognize the inherent inability of language to eliminate all possible ambiguity. ( Robinson v. United States (1945) 324 U.S. 282, 286, 65 S.Ct. 666, 89 L.Ed. 944 ["In most English words and phrases there lurk uncertainties."].) The Constitution therefore "demands ' " 'no more than a reasonable degree of certainty.' " ' " ( People v. Hall , supra , 2 Cal.5th at p. 503, 213 Cal.Rptr.3d 561, 388 P.3d 794.) " 'It is not necessary that a statute furnish detailed plans and specifications of the acts or conduct prohibited.' " ( People v. Speegle (1997) 53 Cal.App.4th 1405, 1411, 62 Cal.Rptr.2d 384.) The constitutional proscription against vagueness does not preclude " 'the use of ordinary terms to express ideas.' " ( Ibid . ; see also City of Costa Mesa v. Soffer (1992) 11 Cal.App.4th 378, 387, 13 Cal.Rptr.2d 735 ["A statute is not vague if an ordinary person exercising ordinary common sense can sufficiently understand and comply with its language."].) And the relevant question is whether a person who wants to comply with the law can reasonably understand how to do so-not whether a person seeking to break the law can find some ambiguity in it. (See Grayned v. City of Rockford (1972) 408 U.S. 104, 108, 92 S.Ct. 2294, 33 L.Ed.2d 222 ["[B]ecause we assume that [one] is free to steer between lawful and unlawful conduct, we insist that laws give the person of ordinary intelligence a reasonable opportunity to know what is prohibited, so that he may act accordingly. Vague laws may trap the innocent by not providing fair warning."].)
The probation condition here expresses in ordinary language what defendant must do to comply with it: stay away from the Apple campus. The common sense meaning of "stay away" in this context is "do not go to or enter" the identified premises. We believe this is what a person of ordinary *1246intelligence would understand when told to stay away from a place. The word "away" is so commonly used and ingrained in our vocabulary that one hardly needs to resort to a dictionary to define it. But consistent with our understanding of its meaning in this context, a dictionary definition of "away" is "from this or that place." (Webster's 3d New Internat. Dict. (1993) p. 152.) Had the trial court wanted to prohibit defendant from coming within a certain distance of the Apple campus it could have done so, but that would be a different condition.
Merely because a condition could have been drafted with more precision does not make it unconstitutional. ( People v. Hall, supra, 2 Cal.5th at p. 503, 213 Cal.Rptr.3d 561, 388 P.3d 794 ["[T]he question before us is not whether this degree of precision would be desirable in principle, but whether it is constitutionally compelled."].) There are reasons the trial *413court might have preferred a condition requiring defendant to simply stay away from the location over one prohibiting him from coming within a certain distance. Based on the facts of a particular case or the circumstances of a particular probationer, a trial court might well conclude that a specified distance is appropriate as part of a stay away order. But the failure to include one does not make the condition vague. The Constitution requires a reasonable degree of certainty in probation conditions. Beyond that, the level of precision with which the condition is stated is best left to the sound discretion of the trial court.
Defendant also argues the stay away condition is vague because it does not more specifically define the "Apple campus." But the word "campus" is understandable enough and is not unconstitutionally vague. ( In re Edward B. (2017) 10 Cal.App.5th 1228, 1237, 217 Cal.Rptr.3d 225 [probation condition prohibiting being on a school campus not vague].) Because any violation of a probation condition must be willful, if defendant were to be in a place that he did not know is within the Apple campus, he would not be in violation of his probation. ( Ibid. , citing People v. Hall, supra, 2 Cal.5th 494, 501-502, 213 Cal.Rptr.3d 561, 388 P.3d 794 ; see also People v. Cervantes (2009) 175 Cal.App.4th 291, 295, 95 Cal.Rptr.3d 858 [no probation violation unless the probationer willfully violates a condition].)
The law does not always succeed in expressing concepts in a clear and understandable way. But an order that someone "stay away" from an identified location is a simple command stated in plain language. The probation condition challenged here need not specify a distance in order to satisfy the important objectives of fair warning and legitimate enforcement.
*1247III. DISPOSITION
The order is affirmed.
WE CONCUR:
Elia, Acting P.J.
Premo, J.