1 files changed, 1 insertions, 0 deletions
diff --git a/re.c b/re.c
index 49424eb632..61f6990d04 100644
--- a/re.c
+++ b/re.c
@@ -2960,6 +2960,7 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
     rb_encoding *str_enc = rb_enc_get(str);
     rb_encoding *src_enc = rb_enc_get(src);
 
+    rb_enc_check(str, src);
     p = s = RSTRING_PTR(str);
     e = s + RSTRING_LEN(str);