Nonketotic hyperglycinemia is an inborn error of glycine metabolism. It manifests mostly as an acute encephalopathy in the neonatal period, although later, atypical presentations have also been reported. Mutations in 3 different genes have been implicated in nonketotic hyperglycinemia. Here we report a novel mutation, c.2296G>T (p.Gly766Cys), in exon 19 of the glycine decarboxylase (GLDC) gene (Refseq accession number NM_000170.2) in a consanguineous Indian couple with a history of 4 neonatal deaths.