| diff --git a/src/textfile.c b/src/textfile.c | |
| index 2712cd8..74c58fb 100644 | |
| --- a/src/textfile.c | |
| +++ b/src/textfile.c | |
| @@ -338,7 +338,7 @@ static char *read_key(const char *pathname, const char *key, int icase) | |
| goto unmap; | |
| } | |
| - end = strnpbrk(off, size - (map - off), "\r\n"); | |
| + end = strnpbrk(off, size - (off - map), "\r\n"); | |
| if (!end) { | |
| err = -EILSEQ; | |
| goto unmap; |