diff --git a/paddle/strings/stringpiece.h b/paddle/strings/stringpiece.h
index 89aa084a2920c6f372b771e0e407b64728ea69e4..b452116057cb1d6ad53d5bb42d65221526d6a4fe 100644
--- a/paddle/strings/stringpiece.h
+++ b/paddle/strings/stringpiece.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <string>
+#include <ostream>
 
 namespace paddle {