diff --git a/wp-includes/user.php b/wp-includes/user.php
index 9b4c1c7..e3a9f2a 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -2472,7 +2472,7 @@ function wp_update_user( $userdata ) {
 	}

 	// Updating user email address.
-	if ( isset( $userdata['user_email'] ) && $user->user_email !== $userdata['user_email'] ) {
+	if ( isset( $userdata['user_email'] ) && 0 !== strcasecmp( $user->user_email, $userdata['user_email'] ) ) {
 		/**
 		 * Fires immediately before the user email is changed.
 		 *
@@ -2601,7 +2601,7 @@ function wp_update_user( $userdata ) {
 	}

 	// If the email address has changed, send a notification.
-	if ( $user_email !== $old_user_data->user_email ) {
+	if ( 0 !== strcasecmp( $user_email, $old_user_data->user_email ) ) {
 		/**
 		 * Fires after the user email has changed.
 		 *