diff --git a/public/language/en_GB/error.json b/public/language/en_GB/error.json
index 73bd2ce7db..5ce4489fc8 100644
--- a/public/language/en_GB/error.json
+++ b/public/language/en_GB/error.json
@@ -99,6 +99,7 @@
 	"downvoting-disabled": "Downvoting is disabled",
 	"not-enough-reputation-to-downvote": "You do not have enough reputation to downvote this post",
 	"not-enough-reputation-to-flag": "You do not have enough reputation to flag this post",
+	"already-flagged": "You have already flagged this post",
 
 	"reload-failed": "NodeBB encountered a problem while reloading: \"%1\". NodeBB will continue to serve the existing client-side assets, although you should undo what you did just prior to reloading.",