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-rw-r--r--sprintf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sprintf.c b/sprintf.c
index 9f3183a..2bcf138 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -660,7 +660,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
str = rb_obj_as_string(arg);
if (OBJ_TAINTED(str)) tainted = 1;
len = RSTRING_LEN(str);
- enc = rb_enc_check(result, str);
+ enc = rb_enc_check(rb_str_substr(result, 0, blen), str);
if (flags&(FPREC|FWIDTH)) {
slen = rb_enc_strlen(RSTRING_PTR(str),RSTRING_END(str),enc);
if (slen < 0) {