diff --git a/sprockets/mixins/http/__init__.py b/sprockets/mixins/http/__init__.py
index 180201c..f6775f7 100644
--- a/sprockets/mixins/http/__init__.py
+++ b/sprockets/mixins/http/__init__.py
@@ -446,7 +446,7 @@ class HTTPClientMixin:
             request_headers.setdefault(
                 'Content-Type',
                 str(content_type) or str(CONTENT_TYPE_MSGPACK))
-        if hasattr(self, 'correlation_id'):
+        if hasattr(self, 'correlation_id') and self.correlation_id:
             request_headers.setdefault('Correlation-Id', self.correlation_id)
         elif hasattr(self, 'request') and \
                 self.request.headers.get('Correlation-Id'):
diff --git a/tests.py b/tests.py
index f6906dd..243e42f 100644
--- a/tests.py
+++ b/tests.py
@@ -243,6 +243,16 @@ class MixinTestCase(testing.AsyncHTTPTestCase):
         self.assertEqual(response.code, 502)
         self.assertEqual(response.attempts, 3)
 
+    @testing.gen_test
+    def test_correlation_id_is_none(self):
+        mixin = self.create_mixin()
+        mixin.correlation_id = None
+        response = yield mixin.http_fetch(
+            self.get_url('/error?status_code=502'))
+        self.assertFalse(response.ok)
+        self.assertEqual(response.code, 502)
+        self.assertEqual(response.attempts, 3)
+
     @testing.gen_test
     def test_get(self):
         response = yield self.mixin.http_fetch(