diff --git a/hardware/arduino/cores/arduino/Print.cpp b/hardware/arduino/cores/arduino/Print.cpp
index 53961ec478c..ff6a16343e3 100755
--- a/hardware/arduino/cores/arduino/Print.cpp
+++ b/hardware/arduino/cores/arduino/Print.cpp
@@ -53,11 +53,7 @@ size_t Print::print(const __FlashStringHelper *ifsh)
 
 size_t Print::print(const String &s)
 {
-  size_t n = 0;
-  for (uint16_t i = 0; i < s.length(); i++) {
-    n += write(s[i]);
-  }
-  return n;
+  return write((const uint8_t *)s.c_str(), s.length());
 }
 
 size_t Print::print(const char str[])