The branching fraction for the NH2+NO reaction has been determined in the temperature range 1210-1370 K from flow reactor experiments on the NH3/NO/O2 and CO/NH3/NO/O-2 systems. The branching fraction is defined as alpha=k(1)/(k(1)+k(2)), where NH2+NO-->NNH+OH (1) and NH2+NO-->N-2+H2O (2). The experiments were performed at very low oxygen concentrations to minimize the impact of secondary reactions. The results show that a increases gradually from a value of 0.35+/-0.04 at 1211 K to 0.45+/-0.02 at 1369 K. The data blend smoothly with the most recent direct measurements and confirm the significant rise in branching fraction suggested by previous high-temperature determinations in static reactors and flames.