diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index 03b8593a8..a0025bd12 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v431
\ No newline at end of file
+v432
\ No newline at end of file
diff --git a/lib/Quote.php b/lib/Quote.php
index 438c010de..e99511e49 100644
--- a/lib/Quote.php
+++ b/lib/Quote.php
@@ -222,7 +222,7 @@ public function pdf($readBodyChunkCallable, $params = null, $opts = null)
     {
         $opts = \Stripe\Util\RequestOptions::parse($opts);
         if (!isset($opts->apiBase)) {
-            $opts->apiBase = Stripe::$apiUploadBase;
+            $opts->apiBase = \Stripe\Stripe::$apiUploadBase;
         }
         $url = $this->instanceUrl() . '/pdf';
         $this->_requestStream('get', $url, $readBodyChunkCallable, $params, $opts);
diff --git a/lib/Service/Tax/FormService.php b/lib/Service/Tax/FormService.php
index 84ee88454..b52ec904a 100644
--- a/lib/Service/Tax/FormService.php
+++ b/lib/Service/Tax/FormService.php
@@ -36,6 +36,11 @@ public function all($params = null, $opts = null)
      */
     public function pdf($id, $readBodyChunkCallable, $params = null, $opts = null)
     {
+        $opts = \Stripe\Util\RequestOptions::parse($opts);
+        if (!isset($opts->apiBase)) {
+            $opts->apiBase = $this->getClient()->getFilesBase();
+        }
+
         return $this->requestStream('get', $this->buildPath('/v1/tax/forms/%s/pdf', $id), $readBodyChunkCallable, $params, $opts);
     }
 
diff --git a/lib/Tax/Form.php b/lib/Tax/Form.php
index ec35cff03..8828030d3 100644
--- a/lib/Tax/Form.php
+++ b/lib/Tax/Form.php
@@ -45,7 +45,7 @@ public function pdf($readBodyChunkCallable, $params = null, $opts = null)
     {
         $opts = \Stripe\Util\RequestOptions::parse($opts);
         if (!isset($opts->apiBase)) {
-            $opts->apiBase = Stripe::$apiUploadBase;
+            $opts->apiBase = \Stripe\Stripe::$apiUploadBase;
         }
         $url = $this->instanceUrl() . '/pdf';
         $this->_requestStream('get', $url, $readBodyChunkCallable, $params, $opts);