diff --git a/src/Common/Internal/Authentication/StorageAuthScheme.php b/src/Common/Internal/Authentication/StorageAuthScheme.php
index 7dd4b1f2c..7cb3d3a94 100644
--- a/src/Common/Internal/Authentication/StorageAuthScheme.php
+++ b/src/Common/Internal/Authentication/StorageAuthScheme.php
@@ -181,12 +181,9 @@ protected function computeCanonicalizedResource($url, $queryParams)
         // 9. Group query parameters
         // 10. Append a new line character (\n) after each name-value pair.
         foreach ($queryParams as $key => $value) {
-            // Grouping query parameters
-            $values = explode(Resources::SEPARATOR, $value);
-            sort($values);
-            $separated = implode(Resources::SEPARATOR, $values);
-
-            $canonicalizedResource .= "\n" . $key . ':' . $separated;
+            // $value must already be ordered lexicographically
+            // See: ServiceRestProxy::groupQueryValues
+            $canonicalizedResource .= "\n" . $key . ':' . $value;
         }
 
         return $canonicalizedResource;
diff --git a/tests/unit/Common/Internal/Authentication/StorageAuthSchemeTest.php b/tests/unit/Common/Internal/Authentication/StorageAuthSchemeTest.php
index 48c42467e..a0e8fe472 100644
--- a/tests/unit/Common/Internal/Authentication/StorageAuthSchemeTest.php
+++ b/tests/unit/Common/Internal/Authentication/StorageAuthSchemeTest.php
@@ -24,6 +24,7 @@
 
 namespace MicrosoftAzure\Storage\Tests\Unit\Common\Internal\Authentication;
 use MicrosoftAzure\Storage\Common\Internal\Authentication\StorageAuthScheme;
+use MicrosoftAzure\Storage\Common\Internal\ServiceRestProxy;
 use MicrosoftAzure\Storage\Tests\Unit\Utilities;
 use MicrosoftAzure\Storage\Tests\Mock\Common\Internal\Authentication\StorageAuthSchemeMock;
 use MicrosoftAzure\Storage\Tests\Framework\TestResources;
@@ -94,7 +95,13 @@ public function testComputeCanonicalizedResourceMockMultipleValues()
     {
         $queryVariables = array();
         $queryVariables['COMP'] = 'list';
-        $queryVariables[Resources::QP_INCLUDE] = 'snapshots,metadata,uncommittedblobs';
+        $queryVariables[Resources::QP_INCLUDE] = ServiceRestProxy::groupQueryValues(
+            array(
+                'snapshots',
+                'metadata',
+                'uncommittedblobs'
+            )
+        );
         $expectedQueryPart = "comp:list\ninclude:metadata,snapshots,uncommittedblobs";
         $accountName = TestResources::ACCOUNT_NAME;
         $url = TestResources::URI1;