diff --git a/hardware/arduino/cores/arduino/WString.cpp b/hardware/arduino/cores/arduino/WString.cpp
index 91d4f1513..5af89e3a8 100644
--- a/hardware/arduino/cores/arduino/WString.cpp
+++ b/hardware/arduino/cores/arduino/WString.cpp
@@ -86,7 +86,7 @@ String::String( const unsigned long value, const int base )
 
 char String::charAt( unsigned int loc ) const
 {
-	return operator[]( loc );
+  return operator[]( loc );
 }
 
 void String::setCharAt( unsigned int loc, const char aChar )