  We analyze the presence of an ambiguity in the pion electromagnetic form
factor within a renormalizable version of the Nambu-Jona-Lasinio model. We
found out that the ambiguity present on the evaluation of the form factor
decouples from its transversal part, confirming previous results obtained
ignoring the ambiguity. This result helps us to understand the role played by
finite but undetermined quantities in Quantum Field Theories.
