diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index e9dd0b4b7f..6d544020d8 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -2069,6 +2069,7 @@ en:
 
       merge:
         confirm:
+          one: "Are you sure you want to merge those posts?"
           other: "Are you sure you want to merge those {{count}} posts?"
 
       revisions: