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-rw-r--r--encoding.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/encoding.c b/encoding.c
index 38a0cf9c7c..97d930701b 100644
--- a/encoding.c
+++ b/encoding.c
@@ -1125,6 +1125,7 @@ rb_filesystem_encindex(void)
char cp[sizeof(int) * 8 / 3 + 4];
snprintf(cp, sizeof cp, "CP%d", AreFileApisANSI() ? GetACP() : GetOEMCP());
idx = rb_enc_find_index(cp);
+ if (idx < 0) idx = rb_ascii8bit_encindex();
#elif defined __APPLE__
idx = rb_utf8_encindex();
#else