diff --git a/Python/fileutils.c b/Python/fileutils.c
index 35869c8..b413f4e 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -128,7 +128,7 @@
     loc = setlocale(LC_CTYPE, NULL);
     if (loc == NULL)
         goto error;
-    if (strcmp(loc, "C") != 0) {
+    if (strcmp(loc, "C") != 0 && strcmp(loc, "POSIX") != 0) {
         /* the LC_CTYPE locale is different than C */
         return 0;
     }