diff --git a/build/download-fimoct.js b/build/download-fimoct.js
index f67a3f6..cbcd922 100644
--- a/build/download-fimoct.js
+++ b/build/download-fimoct.js
@@ -34,8 +34,7 @@ async function getLatestFIMOCTArchiveURL() {
   return latestArchive.url
 }
 
-async function getLatestFIMOCTFileBuffer() {
-  const url = await getLatestFIMOCTArchiveURL()
+async function fetchAndExtractFIMOCT(url) {
   const response = await request.get(url)
     .buffer(true)
     .parse(request.parse['application/octet-stream'])
@@ -47,4 +46,14 @@ async function getLatestFIMOCTFileBuffer() {
   return candidateFile.data
 }
 
-module.exports = {getLatestFIMOCTFileBuffer}
+async function getLatestFIMOCTFileBuffer() {
+  const url = await getLatestFIMOCTArchiveURL()
+  return fetchAndExtractFIMOCT(url)
+}
+
+async function getCurrentFIMOCTFileBuffer() {
+  const url = 'https://www.data.gouv.fr/s/resources/fichiers-fimoca-et-fimoct-relatifs-aux-structures-de-la-dgfip/20171222-100050/FIMOCTT7Z00061.zip'
+  return fetchAndExtractFIMOCT(url)
+}
+
+module.exports = {getLatestFIMOCTFileBuffer, getCurrentFIMOCTFileBuffer}
diff --git a/build/index.js b/build/index.js
index ab53575..26e57f8 100644
--- a/build/index.js
+++ b/build/index.js
@@ -3,7 +3,7 @@ const fs = require('fs')
 const {join} = require('path')
 const {promisify} = require('util')
 const {chain, pick} = require('lodash')
-const {getLatestFIMOCTFileBuffer} = require('./download-fimoct')
+const {getCurrentFIMOCTFileBuffer} = require('./download-fimoct')
 const {extractFromFIMOCT} = require('./extract-fimoct')
 const {getIndexedCommunes} = require('./cog')
 
@@ -35,7 +35,7 @@ function buildCompact(codesPostaux) {
 }
 
 async function doStuff() {
-  const buffer = await getLatestFIMOCTFileBuffer()
+  const buffer = await getCurrentFIMOCTFileBuffer()
   const codesPostaux = await extractFromFIMOCT(buffer)
   const communes = await getIndexedCommunes()
   codesPostaux.forEach(e => expandWithCommune(e, communes))