One of the tendencies among scribes who transmitted the corpus Philonicum was to divide treatises into smaller units. This article argues that Philo’s De gigantibus and Quod Deus sit immutabilis were originally a single treatise that scribes split in an effort to create thematic unities for each half. Two lines of evidence support this conclusion. There is significant evidence that the two treatises circulated as a single work in antiquity. The most important evidence lies in the titles. Eusebius knew a compound title for a single work and the eighth-century compilers of the Sacra parallela attributed fragments from Quod Deus sit immutabilis to De gigantibus. The second line of evidence is internal. De gigantibus is noticeably shorter than any other treatise in the Allegorical Commentary with the exception of De sobrietate that may be incomplete. More importantly, the work concludes with an internal transitional phrase that introduces the citation that opens Quod Deus sit immutabilis. While Philo creates a bridge between treatises, this is an internal transition marker. For these reasons, we should discontinue following the scribal tradition and reunite the two halves of Philo’s treatise.