Used (often sarcastically) of a change to a program that is thought to be trivial or insignificant right up to the moment it crashes the system. Usually "cured" by another one-line fix. See also I didn't change anything!
ONE-LINE FIX
Meaning of ONE-LINE FIX in English
FOLDOC computer English dictionary. Английский словарь по компьютерам FOLDOC. 2012