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-rw-r--r--Modules/posixmodule.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index f7b16a0..2a1efa6 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -300,7 +300,8 @@ convertenviron()
if (v == NULL)
continue;
*p = '\0';
- (void) PyDict_SetItemString(d, *e, v);
+ if (PyDict_GetItemString(d, *e) == NULL)
+ (void) PyDict_SetItemString(d, *e, v);
*p = '=';
Py_DECREF(v);
}