Fix the build with newer gcc versions.
Fix the build with newer gcc versions.

urialon/Nice2Predict,chubbymaggie/Nice2Predict,chubbymaggie/Nice2Predict,lazyparser/Nice2Predict,eth-srl/Nice2Predict,eth-srl/Nice2Predict,lazyparser/Nice2Predict,chubbymaggie/Nice2Predict,urialon/Nice2Predict,urialon/Nice2Predict,lazyparser/Nice2Predict,lazyparser/Nice2Predict,urialon/Nice2Predict,chubbymaggie/Nice2Predict,eth-srl/Nice2Predict,chubbymaggie/Nice2Predict,lazyparser/Nice2Predict,eth-srl/Nice2Predict,eth-srl/Nice2Predict,urialon/Nice2Predict