1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index eb16998c0a..7c179d3cce 100644
--- a/string.c
+++ b/string.c
@@ -1617,7 +1617,7 @@ rb_str_plus(VALUE str1, VALUE str2)
     TERM_FILL(&ptr3[len1+len2], rb_enc_mbminlen(enc));
 
     FL_SET_RAW(str3, OBJ_TAINTED_RAW(str1) | OBJ_TAINTED_RAW(str2));
-    ENCODING_CODERANGE_SET(str3, rb_enc_to_index(enc),
+    ENCODING_CODERANGE_SET(str3, enc_to_index(enc),
 			   ENC_CODERANGE_AND(ENC_CODERANGE(str1), ENC_CODERANGE(str2)));
     RB_GC_GUARD(str1);
     RB_GC_GUARD(str2);