In the title compound, C(12)H(13)N(3)O(2), the dihedral angle between the oxazolone ring and the benzimidazole unit is 45.0 (5)°, exhibiting a staggered conformation at the Cα-Cβ bond. In the crystal, a strong N-H⋯N hydrogen bond links the mol-ecules into a C(4) chain along the c axis while a C-H⋯O hydrogen-bonding inter-action generates a C(5) chain along the a axis, i.e. perpendicular to the other chain.