diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 391fa577..a9fbf884 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,11 @@
 Changelog
 +++++++++
 
+1.2.1 (2024-03-28)
+==================
+
+- Avoid error when terminal width is undetectable on Python < 3.11
+  (PR :pr:`761`)
 
 1.2.0 (2024-03-27)
 ==================
diff --git a/src/build/__main__.py b/src/build/__main__.py
index ebbe6b83..8868a368 100644
--- a/src/build/__main__.py
+++ b/src/build/__main__.py
@@ -69,6 +69,8 @@ def _showwarning(
 
 
 _max_terminal_width = shutil.get_terminal_size().columns - 2
+if _max_terminal_width <= 0:
+    _max_terminal_width = 78
 
 
 _fill = partial(textwrap.fill, subsequent_indent='  ', width=_max_terminal_width)