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-rw-r--r--pym/portage/output.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/pym/portage/output.py b/pym/portage/output.py
index a4ca3a306..3fbb0c992 100644
--- a/pym/portage/output.py
+++ b/pym/portage/output.py
@@ -270,7 +270,10 @@ def xtermTitleReset():
if prompt_command == "":
default_xterm_title = ""
elif prompt_command is not None:
- if dotitles and "TERM" in os.environ and sys.stderr.isatty():
+ if dotitles and \
+ 'TERM' in os.environ and \
+ _legal_terms_re.match(os.environ['TERM']) is not None and \
+ sys.stderr.isatty():
from portage.process import find_binary, spawn
shell = os.environ.get("SHELL")
if not shell or not os.access(shell, os.EX_OK):