diff --git a/client/src/observatory/results/human-duration.tsx b/client/src/observatory/results/human-duration.tsx
index 6ef1e2207b1d..5eb5dacdadae 100644
--- a/client/src/observatory/results/human-duration.tsx
+++ b/client/src/observatory/results/human-duration.tsx
@@ -43,7 +43,7 @@ function displayString(date: Date) {
   // up to 30 days as days
   if (diffSecs < 60 * 60 * 24 * 30) {
     const days = Math.floor(diffSecs / 86400);
-    return days === 1 ? `Yesterday` : `${days} days ago`;
+    return days === 1 ? `1 day ago` : `${days} days ago`;
   }
 
   // after a week, return the formatted date