diff --git a/src/wp-includes/ms-functions.php b/src/wp-includes/ms-functions.php
index b0cd44ce8d..04f4294de8 100644
--- a/src/wp-includes/ms-functions.php
+++ b/src/wp-includes/ms-functions.php
@@ -2435,14 +2435,3 @@ function wp_get_sites( $args = array() ) {
 
 	return $site_results;
 }
-
-/**
- * Determine if the current network should be treated as a trusted network.
- *
- * @since 4.1.0
- *
- * @return bool False.
- */
-function wp_is_trusted_network() {
-	return false;
-}
\ No newline at end of file