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-rw-r--r--src/basic/util.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/basic/util.c b/src/basic/util.c
index a9071aa117..737f2a221c 100644
--- a/src/basic/util.c
+++ b/src/basic/util.c
@@ -4273,7 +4273,7 @@ bool is_locale_utf8(void) {
/* Check result, but ignore the result if C was set
* explicitly. */
cached_answer =
- streq(set, "C") &&
+ STR_IN_SET(set, "C", "POSIX") &&
!getenv("LC_ALL") &&
!getenv("LC_CTYPE") &&
!getenv("LANG");