if it ain't broke don't fix it

Idioms  

1. Don't meddle with something that's functioning adequately. For example, So long as they like our proposal let's not change it; if it ain't broke don't fix it. This folksy and deliberately ungrammatical expression dates from the mid-1900s. For a synonym, see leave well enough alone.

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Example Sentences

If it ain’t broke don’t fix it.

From Los Angeles Times

There are those who say "if it ain't broke, don't fix it".

From BBC

There is truth in the saying "If it ain’t broke, don’t fix it."

From Salon

As the age-old saying goes, if it ain't broke don't fix it - which is something author Bella Mackie has certainly stuck by.

From BBC

Wooden’s response during that timeout: “Why? If it ain’t broke, don’t fix it.”

From Seattle Times