diff --git a/cmd/web.go b/cmd/web.go
index b6c014a2e..8fed559ff 100644
--- a/cmd/web.go
+++ b/cmd/web.go
@@ -102,7 +102,10 @@ func runLetsEncryptFallbackHandler(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "Use HTTPS", http.StatusBadRequest)
 		return
 	}
-	target := setting.AppURL + r.URL.RequestURI()
+	// Remove the trailing slash at the end of setting.AppURL, the request
+	// URI always contains a leading slash, which would result in a double
+	// slash
+	target := strings.TrimRight(setting.AppURL, "/") + r.URL.RequestURI()
 	http.Redirect(w, r, target, http.StatusFound)
 }