diff --git a/paddle/fluid/string/printf.h b/paddle/fluid/string/printf.h
index e0f6202506868fd0dcbe93297785682edbcfe792..062095a1c3e977c0bcc89346ead765acb023bcf7 100644
--- a/paddle/fluid/string/printf.h
+++ b/paddle/fluid/string/printf.h
@@ -84,7 +84,7 @@ void Fprintf(std::ostream& out, const char* fmt, const Args&... args) {
 }
 
 template <typename... Args>
-std::string Sprintf(const char* fmt = "", const Args&... args) {
+std::string Sprintf(const char* fmt, const Args&... args) {
   std::ostringstream oss;
   Fprintf(oss, fmt, args...);
   return oss.str();