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From https://developers.google.com/protocol-buffers/docs/proto#optional: If the default value is not specified for an optional element, a type-specific default value is used instead: for strings, the default value is the empty string. For bools, the default value is false. For numeric types, the default value is zero. For enums, the default value is the first value listed in the enum's type definition. This means care must be taken when adding a value to the beginning of an enum value list. Prior to this change, protoc-c set the default enum value to 0, whether or not 0 was the first value listed in the enum's type definition (or if it even was listed at all).