diff --git a/sentry-ruby/lib/sentry/telemetry_event_buffer.rb b/sentry-ruby/lib/sentry/telemetry_event_buffer.rb
index 8c5ce0781..5122a4af9 100644
--- a/sentry-ruby/lib/sentry/telemetry_event_buffer.rb
+++ b/sentry-ruby/lib/sentry/telemetry_event_buffer.rb
@@ -84,7 +84,7 @@ def send_items
       envelope = Envelope.new(
         event_id: Sentry::Utils.uuid,
         sent_at: Sentry.utc_now.iso8601,
-        dsn: @dsn,
+        dsn: @dsn.to_s,
         sdk: Sentry.sdk_meta
       )
 
diff --git a/sentry-ruby/spec/sentry/metrics_spec.rb b/sentry-ruby/spec/sentry/metrics_spec.rb
index 874c1e8d0..78284e489 100644
--- a/sentry-ruby/spec/sentry/metrics_spec.rb
+++ b/sentry-ruby/spec/sentry/metrics_spec.rb
@@ -248,7 +248,7 @@
 
           expect(headers[:event_id]).to match(/\A[0-9a-f]{32}\z/) # UUID format
           expect(headers[:sent_at]).to match(/\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/) # ISO8601 timestamp
-          expect(headers[:dsn]).to eq(Sentry.configuration.dsn)
+          expect(headers[:dsn]).to eq(Sentry.configuration.dsn.to_s)
           expect(headers[:sdk]).to eq(Sentry.sdk_meta)
         end