diff --git a/.deadcode-out b/.deadcode-out
index 6043eb64ba..4e72fc8649 100644
--- a/.deadcode-out
+++ b/.deadcode-out
@@ -233,9 +233,6 @@ code.gitea.io/gitea/modules/web
 	RouteMock
 	RouteMockReset
 
-code.gitea.io/gitea/modules/web/middleware
-	DeleteLocaleCookie
-
 code.gitea.io/gitea/modules/zstd
 	NewWriter
 	Writer.Write
diff --git a/modules/web/middleware/locale.go b/modules/web/middleware/locale.go
index 1f37407201..9653a6f349 100644
--- a/modules/web/middleware/locale.go
+++ b/modules/web/middleware/locale.go
@@ -53,9 +53,3 @@ func Locale(resp http.ResponseWriter, req *http.Request) translation.Locale {
 func SetLocaleCookie(resp http.ResponseWriter, lang string, maxAge int) {
 	SetSiteCookie(resp, "lang", lang, maxAge)
 }
-
-// DeleteLocaleCookie convenience function to delete the locale cookie consistently
-// Setting the lang cookie will trigger the middleware to reset the language to previous state.
-func DeleteLocaleCookie(resp http.ResponseWriter) {
-	SetSiteCookie(resp, "lang", "", -1)
-}