diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 6dced9e4622..25e51ea9f94 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -8664,7 +8664,8 @@ function getremoteaddr($default='0.0.0.0') {
             } else {
                 // Remove port from IPv4.
                 if (substr_count($address, ":") == 1) {
-                    $address = explode(":", $address)[0];
+                    $parts = explode(":", $address);
+                    $address = $parts[0];
                 }
             }