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-rw-r--r--builtin/merge.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/builtin/merge.c b/builtin/merge.c
index ed0f959ac4..d3e1e8dc9e 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1129,7 +1129,7 @@ static int default_edit_option(void)
/* Use editor if stdin and stdout are the same and is a tty */
return (!fstat(0, &st_stdin) &&
!fstat(1, &st_stdout) &&
- isatty(0) &&
+ isatty(0) && isatty(1) &&
st_stdin.st_dev == st_stdout.st_dev &&
st_stdin.st_ino == st_stdout.st_ino &&
st_stdin.st_mode == st_stdout.st_mode);