diff --git a/lib/tests.sh b/lib/tests.sh
index b233aaa..1dfa671 100644
--- a/lib/tests.sh
+++ b/lib/tests.sh
@@ -236,7 +236,7 @@ _VALIDATE_THAT_APP_CAN_BE_ACCESSED () {
                 log_debug "The connection attempt fall on the YunoHost portal."
                 fell_on_sso_portal=1
                 # Falling on NGINX default page is an error.
-            elif echo "$page_title" | grep -q "Welcome to NGINX"
+            elif echo "$page_title" | grep -q "Welcome to nginx"
             then
                 log_error "The connection attempt fall on NGINX default page."
                 curl_error=1