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-rw-r--r--sideband.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sideband.c b/sideband.c
index d1125f5c52..7f9dc229fb 100644
--- a/sideband.c
+++ b/sideband.c
@@ -30,7 +30,7 @@ int recv_sideband(const char *me, int in_stream, int out)
memcpy(buf, PREFIX, pf);
term = getenv("TERM");
- if (term && strcmp(term, "dumb"))
+ if (isatty(2) && term && strcmp(term, "dumb"))
suffix = ANSI_SUFFIX;
else
suffix = DUMB_SUFFIX;