diff --git a/contentScript.js b/contentScript.js
index 4e17453..1921d5d 100644
--- a/contentScript.js
+++ b/contentScript.js
@@ -343,6 +343,7 @@ if (typeof Overlay === "undefined") {
         }
 
         lines += `<tr style="text-align: right; color: ${color}"><td>${minutes}&nbsp;</td><td>&nbsp;${calories}</td></tr>`;
+        lastDiff = 0;
       });
 
       if (lines.length > 0) {