diff --git a/browser/BrowserPerf.proto b/browser/BrowserPerf.proto
index 2db3fd2..9e3f13f 100644
--- a/browser/BrowserPerf.proto
+++ b/browser/BrowserPerf.proto
@@ -132,8 +132,8 @@ message BrowserWebVitalsPerfData {
     string pagePath = 4;
     // First Meaningful Paint time
     int32 fmpTime = 5;
-    // Cumulative Layout Shift time
-    int32 clsTime = 6;
+    // Cumulative Layout Shift score
+    double cls = 6;
     // Largest Contentful Paint time
     int32 lcpTime = 7;
 }