1 files changed, 1 insertions, 0 deletions
diff --git a/io.c b/io.c
index 31a86da6b9..1e6b26b5e4 100644
--- a/io.c
+++ b/io.c
@@ -1042,6 +1042,7 @@ rb_io_tell(VALUE io)
     GetOpenFile(io, fptr);
     pos = io_tell(fptr);
     if (pos < 0 && errno) rb_sys_fail_path(fptr->pathv);
+    pos -= fptr->rbuf_len;
     return OFFT2NUM(pos);
 }