At present, there are several hints of lepton flavor non-universality. The LHCb Collaboration has measured R K≡ B (B+→ K+ μ+ μ−)/B (B+→ K+ e+ e−), and the BaBar Collaboration has measured R (D (⁎))≡ B (B¯→ D (⁎)+ τ− ν¯ τ)/B (B¯→ D (⁎)+ ℓ− ν¯ ℓ)(ℓ= e, μ). In all cases, the experimental results differ from the standard model predictions by 2–3 σ. Recently, an explanation of the R K puzzle was proposed in which new physics (NP) generates a neutral-current operator involving only third-generation particles. Now, assuming the scale of NP is much larger than the weak scale, this NP operator must be made invariant under the full SU (3) C× SU (2) L× U (1) Y gauge group. In this Letter, we note that, when this is done, a new charged-current operator can appear, and this can explain the R (D (⁎)) puzzle. A more precise measurement of the double ratio R (D)/R (D⁎) can rule out this model.