diff --git a/analysis.js b/analysis.js
index e02c3bf..8cc61e6 100644
--- a/analysis.js
+++ b/analysis.js
@@ -73,6 +73,7 @@ function mergePriceHistory(oldItems, items) {
 
     const lookup = {};
     for (oldItem of oldItems) {
+        delete oldItem.unavailable;
         lookup[oldItem.store + oldItem.id] = oldItem;
     }