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-rw-r--r--src/pip/_vendor/pep517/build.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/pip/_vendor/pep517/build.py b/src/pip/_vendor/pep517/build.py
index 3b7521453..bc463b2ba 100644
--- a/src/pip/_vendor/pep517/build.py
+++ b/src/pip/_vendor/pep517/build.py
@@ -31,7 +31,7 @@ def load_system(source_dir):
Load the build system from a source dir (pyproject.toml).
"""
pyproject = os.path.join(source_dir, 'pyproject.toml')
- with io.open(pyproject, encoding="utf-8") as f:
+ with io.open(pyproject, 'rb') as f:
pyproject_data = toml_load(f)
return pyproject_data['build-system']