run-time check faluire #2 stack around the variable is corrupted

I am getting an error for the following code

char tmpMaxCompression[19];
double MinVal = 0.0;

//MinVal is dynamic input from the user

sprintf_s( tmpMaxCompression, _countof(tmpMaxCompression) + 1 , "19.2%d" , MinVal );

The error - run-time check failure #2 - stack around the variable 'tmpMaxCompression' was corrupted
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> char tmpMaxCompression[19];
> sprintf_s( tmpMaxCompression, _countof(tmpMaxCompression) + 1 , "19.2%d" , MinVal );

20 chars (including termination '\0') are written to array of size 19
to fix: increase array size, decrease 2nd arg of sprintf_s

char tmpMaxCompression[20];
sprintf_s( tmpMaxCompression, _countof(tmpMaxCompression) , "19.2%d" , MinVal );

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