The sol has appreciated 3.63% against the dollar in the last 12 months.
Castilla said this trend is likely to continue in the long term, but in the short term there could be some volatility as a result of concerns about the global economy.
Castilla said the challenge the stronger sol presents for Peru's exporters comes despite improved productivity among them.
"The government is pushing ahead with a number of measures to help exporters and improve competitiveness," the minister was quoted as saying by Dow Jones Newswires.
This week, the government announced a new stimulus package to support exporters, following a steep decline in exports in April. The decline in April was largely a result of a decline in commodity prices. Mineral exports account for about 60% of Peru's total exports.
Mr. Castilla said the government plans to implement more measures in the coming weeks to support exporters.
He added the government is maintaining its forecast for exports this year, but could revise the figure if the economic situation deteriorates.
Mr. Castilla said he is maintaining a forecast for economic growth this year of about 6%.