diff --git a/Spanner/src/SpannerClient.php b/Spanner/src/SpannerClient.php
index 43244553bc0..a378cc10f95 100644
--- a/Spanner/src/SpannerClient.php
+++ b/Spanner/src/SpannerClient.php
@@ -309,7 +309,7 @@ public function __construct(array $config = [])
         $config = $this->buildClientOptions($config);
         $config['credentials'] = $this->createCredentialsWrapper(
             $config['credentials'],
-            $config['credentialsConfig'] + ['scopes' => $config['scopes']],
+            $config['credentialsConfig'],
             $config['universeDomain']
         );
         $this->projectId = $this->detectProjectId($config);