diff --git a/Spanner/src/Connection/Grpc.php b/Spanner/src/Connection/Grpc.php
index 761e0350b7ae..a47a89f945e6 100644
--- a/Spanner/src/Connection/Grpc.php
+++ b/Spanner/src/Connection/Grpc.php
@@ -779,7 +779,10 @@ public function createSession(array $args)
         $session = $this->pluck('session', $args, false);
         if ($session) {
             $args['session'] = $this->serializer->decodeMessage(new Session,
-                array_filter($session, fn ($value) => !is_null($value)));
+                array_filter($session, function ($value) {
+                    return !is_null($value);
+                }
+            ));
         }
 
         return $this->send([$this->spannerClient, 'createSession'], [