diff --git a/src/RequestWrapper.php b/src/RequestWrapper.php
index 27a8ca78d229..c38313156ad8 100644
--- a/src/RequestWrapper.php
+++ b/src/RequestWrapper.php
@@ -173,6 +173,7 @@ public function getCredentialsFetcher()
         }
 
         if ($this->keyFileStream) {
+            $this->keyFileStream->rewind();
             return CredentialsLoader::makeCredentials($this->scopes, $this->keyFileStream);
         }
 
diff --git a/tests/RequestWrapperTest.php b/tests/RequestWrapperTest.php
index 54b7d8bde106..c09d05b93fac 100644
--- a/tests/RequestWrapperTest.php
+++ b/tests/RequestWrapperTest.php
@@ -104,6 +104,19 @@ public function testCredentialsFetcher($wrapperConfig)
         );
     }
 
+    /**
+     * @dataProvider keyFileCredentialsProvider
+     */
+    public function testCredentialsFromKeyFileStreamCanBeReadMultipleTimes($wrapperConfig)
+    {
+        $requestWrapper = new RequestWrapper($wrapperConfig);
+
+        $requestWrapper->getCredentialsFetcher();
+        $credentials = $requestWrapper->getCredentialsFetcher();
+
+        $this->assertInstanceOf('Google\Auth\FetchAuthTokenInterface', $credentials);
+    }
+
     public function credentialsProvider()
     {
         $config = [
@@ -130,6 +143,25 @@ public function credentialsProvider()
         ];
     }
 
+    public function keyFileCredentialsProvider()
+    {
+        $config = [
+            'authHttpHandler' => function ($request, $options = []) {
+                return new Response(200, [], json_encode(['access_token' => 'abc']));
+            },
+            'httpHandler' => function ($request, $options = []) {
+                return new Response(200, []);
+            }
+        ];
+
+        $keyFilePath = __DIR__ . '/fixtures/json-key-fixture.json';
+
+        return [
+            [$config + ['keyFile' => file_get_contents($keyFilePath)]], // keyFile
+            [$config + ['keyFilePath' => $keyFilePath]], //keyFilePath
+        ];
+    }
+
     public function testAddsUserAgentToRequest()
     {
         $requestWrapper = new RequestWrapper([