diff --git a/lib/datadog/ci.rb b/lib/datadog/ci.rb
index e14f6c96..bede82c0 100644
--- a/lib/datadog/ci.rb
+++ b/lib/datadog/ci.rb
@@ -11,8 +11,10 @@ module Datadog
   module CI
     class << self
       # Starts a {Datadog::CI::TestSesstion ci_test_session} that represents the whole test session run.
+      #
       # Read Datadog documentation on test sessions
       # [here](https://docs.datadoghq.com/continuous_integration/explorer/?tab=testruns#sessions).
+      #
       # Raises an error if a session is already active.
       #
       # The {#start_test_session} method is used to mark the start of the test session:
diff --git a/lib/datadog/ci/recorder.rb b/lib/datadog/ci/recorder.rb
index 3fae5f14..2952fbfb 100644
--- a/lib/datadog/ci/recorder.rb
+++ b/lib/datadog/ci/recorder.rb
@@ -242,13 +242,13 @@ def set_initial_tags(ci_span, tags)
 
       def set_session_context(tags, test_session = nil)
         test_session ||= active_test_session
-        tags[Ext::Test::TAG_TEST_SESSION_ID] = test_session.id if test_session
+        tags[Ext::Test::TAG_TEST_SESSION_ID] = test_session.id.to_s if test_session
       end
 
       def set_module_context(tags, test_module = nil)
         test_module ||= active_test_module
         if test_module
-          tags[Ext::Test::TAG_TEST_MODULE_ID] = test_module.id
+          tags[Ext::Test::TAG_TEST_MODULE_ID] = test_module.id.to_s
           tags[Ext::Test::TAG_MODULE] = test_module.name
         end
       end
@@ -259,7 +259,7 @@ def set_suite_context(tags, span: nil, name: nil)
         test_suite = span || active_test_suite(name)
 
         if test_suite
-          tags[Ext::Test::TAG_TEST_SUITE_ID] = test_suite.id
+          tags[Ext::Test::TAG_TEST_SUITE_ID] = test_suite.id.to_s
           tags[Ext::Test::TAG_SUITE] = test_suite.name
         else
           tags[Ext::Test::TAG_SUITE] = name