An adapter for grounding a protector module in a network interface device (NID) is provided. The adapter includes a body, and at least one ground mount area on the body. Each ground mount area includes a ground post extending from the body and configured to conductively couple to the protector module. A connector extends from the body and is configured to conductively couple to a grounding element of the NID. The body, the at least one ground post and the connector are conductive. The adapter allows for reuse of existing protector modules that do not have a ground adapter for direct mounting to a ground post by using the vertical grounding feature found in the protector module.