U.S. companies are still lagging behind their European Union and British counterparts in achieving compliance with the European Union’s General Data Protection Regulation, according to a survey published Thursday.

According to the report from TrustArc, a data privacy management group, and Dimensional Research, the challenges of working through the ins and outs of the new regulation are a big part of what’s holding these companies back. Sixty-four percent of legal professionals and 69 percent of IT professionals indicated that the complexity of the regulation was among the top issues they face in achieving GDPR compliance.