Integer valued polynomials and Lubin-Tate formal groups

If R is an integral domain and K is its field of fractions, we let Int(R) stand for the subring of Kx] which maps R into itself. We show that if R is the ring of integers of a p-adic field, then Int(R) is generated, as an R-algebra, by the coefficients of the endomorphisms of any Lubin-Tate group attached to R.