This randomized controlled trial focused on 59 struggling readers in the third and fourth grades (30 female, 29 male) and examined the efficacy of an intervention aimed at increasing students' multisyllabic word reading (MWR). The study also explored the relative effects of an embedded motivational beliefs (MB) training component. Struggling readers were randomly assigned to 1 of 3 groups: MWR only, MWR with an MB component (MWR + MB), or business-as-usual control. Students were tutored in small groups in 24 sessions, three 40-minute lessons each week. Students in both MWR groups outperformed the control group on measures of word-reading fluency. MWR + MB students outperformed MWR only on sentence-level comprehension and outperformed the control group in ratings of attributions for success in reading. Findings are discussed in terms of their relevance to MWR instruction for students with persistent reading difficulties and the potential for enhancing intervention through targeting motivation.