diff --git a/google/appengine/runtime/CurlLite.php b/google/appengine/runtime/CurlLite.php
index d3929c63..08482c4c 100644
--- a/google/appengine/runtime/CurlLite.php
+++ b/google/appengine/runtime/CurlLite.php
@@ -484,9 +484,10 @@ private function setOption($key, $value) {
       case CURLOPT_QUOTE:
       case CURLOPT_PROGRESSFUNCTION:
       case CURLOPT_SHARE:
-        throw new CurlLiteOptionNotSupportedException(
-          'Option ' . $key . ' is not supported by this curl implementation.');
-
+        if ($value !== null) {
+          throw new CurlLiteOptionNotSupportedException(
+            'Option ' . $key . ' is not supported by this curl implementation.');
+        }
       // Everything else is a no-op, or will be configured at request time.
       default:
     }