Temperature-dependent Raman spectra of ethylammonium chloride have been studied in the range 80-346 K. Spectral variations around the 221 K transition are marginal. However, the transition at 345 K produces many spectral anomalies. Many internal modes became weaker and broader. The entire lattice mode structure disappears in the prototype phase. Our results indicate that the ethylammonium ions undergo enhanced hindered rotations in prototype phase.