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-rw-r--r--sphinx/cmdline.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/cmdline.py b/sphinx/cmdline.py
index 83f6048de..0d85767e4 100644
--- a/sphinx/cmdline.py
+++ b/sphinx/cmdline.py
@@ -255,7 +255,7 @@ def main(argv):
confoverrides = {}
for val in opts.define:
try:
- key, val = val.split('=')
+ key, val = val.split('=', 1)
except ValueError:
print('Error: -D option argument must be in the form name=value.',
file=sys.stderr)