diff --git a/procio.c b/procio.c
index 2813cd51..f3258ff6 100644
--- a/procio.c
+++ b/procio.c
@@ -251,7 +251,7 @@ ssize_t proc_write(void *c, const char *buf, size_t count)
 				if (cookie->offset > LINELEN)
 					token = (char*)memrchr(cookie->buf+offset, cookie->delim, LINELEN);
 				else
-					token = (char*)memrchr(cookie->buf+offset, '\n', LINELEN);
+					token = (char*)memrchr(cookie->buf+offset, '\n', cookie->offset);
 				if (token)
 					*token = '\n';
 				else {