Fix a buffer overflow issue where the size was fed in wrong.

[codecov-io]

Current coverage is 62.43% (diff: 100%)

Merging #37 into master will decrease coverage by 0.02%

@@             master        #37   diff @@
==========================================
  Files            14         14          
  Lines          3879       3879          
  Methods         256        256          
  Messages          0          0          
  Branches       1042       1042          
==========================================
- Hits           2423       2422     -1   
  Misses         1024       1024          
- Partials        432        433     +1   

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[kjdev]

Thanks.