Sentence Correction

Hi everybody this is not a GMAT question but while writing a document I had trouble with a pronoun ambiguity

The sentence is:

Second the mechanism has to prevent developers from firing events that they did not specify.

My question is if they clearly refers to developers or I should repeat developers since they could refer to events.

Thank you in advance.

Relative pronoun (that, who, which) agree with the immediately preceding noun.
Subject and object pronouns (it, they, them) agree with the subject of the preceding clause or sentence