Defined string with 4 characters is sizeof 4 in watch and 5 in compiled code.

So, just out of curiosity, how can 
 

 sizeof(LOGGER_SERIAL_DEFAULT) 
 

 be both 4 (in the QuckWatch) and 5 in the compiled code (red line in disassembly) ?
 It's defined as:
 

 #define LOGGER_SERIAL_DEFAULT "----"
 

 So in my mind it should be 4 (if the compiler wanted to count the quotes it would be 6) but NEVER 5.
 

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