diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 9d7b977..0f2fbb9 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2007,6 +2007,7 @@
 	for (i = 0; i < argc; i++) {
 		if (!PyArg_Parse((*getitem)(argv, i),
 				 "et;execve() arg 2 must contain only strings",
+				 Py_FileSystemDefaultEncoding,
 				 &argvlist[i]))
 		{
 			lastarg = i;