diff --git a/lib/ddtrace/transport/traces.rb b/lib/ddtrace/transport/traces.rb
index cca596f3077..c35c1b30cf0 100644
--- a/lib/ddtrace/transport/traces.rb
+++ b/lib/ddtrace/transport/traces.rb
@@ -101,6 +101,8 @@ def encode_trace(encoder, trace)
           # Make the trace serializable
           serializable_trace = SerializableTrace.new(trace)
 
+          Datadog.logger.debug { "Flushing trace: #{JSON.dump(serializable_trace)}" }
+
           # Encode the trace
           encoder.encode(serializable_trace)
         end