The use of Eu3+ codoping for enhancing the Ho3+:5I5→5I6 emission in fluoroindate glasses shows that Eu3+ could depopulate the lower laser state Ho3+:5I6 while having little effect on the upper state Ho3+:5I5, resulting in greater population inversion. The Ho3+/Eu3+ codoped glass has high spontaneous transition probability (6.31s-1) together with large emission cross section (7.68×10-21cm2). This study indicates that codoping of Ho3+ with Eu3+ is a feasible alternative to quench the lower energy level of the 3.9 µm emission and the Ho3+/Eu3+ codoped fluoroindate glass is a promising material for efficient 3.9 µm fiber lasers.