diff --git a/src/index.js b/src/index.js
index 87342949f6d3f6a111834e160f59d7ce1a194a5b..4558a4ecb54129aa24b9a3153c8107e80c91f9f5 100755
--- a/src/index.js
+++ b/src/index.js
@@ -147,19 +147,19 @@ async function cleanOldData() {
       }
       log("debug", "NB OF DELETED OLD DAY DATA : " + result.length)
     }
-    const documents = await cozyClient.data.findAll('com.grandlyon.grdf.month')
-    if (documents && documents.length > 0) {
+    const documentsMonth = await cozyClient.data.findAll('com.grandlyon.grdf.month')
+    if (documentsMonth && documentsMonth.length > 0) {
       const result = []
-      for (const doc of documents) {
+      for (const doc of documentsMonth) {
         const deleteResult = await cozyClient.data.delete('com.grandlyon.grdf.month', doc)
         result.push(deleteResult)
       }
       log("debug", "NB OF DELETED OLD MONTH DATA : " + result.length)
     }
-    const documents = await cozyClient.data.findAll('com.grandlyon.grdf.year')
-    if (documents && documents.length > 0) {
+    const documentsYear = await cozyClient.data.findAll('com.grandlyon.grdf.year')
+    if (documentsYear && documentsYear.length > 0) {
       const result = []
-      for (const doc of documents) {
+      for (const doc of documentsYear) {
         await cozyClient.data.delete('com.grandlyon.grdf.year', doc)
         result.push(deleteResult)
       }