diff --git a/error.c b/error.c
index 600be01..0c11be3 100644
--- a/error.c
+++ b/error.c
@@ -1661,6 +1661,19 @@ Init_Exception(void)
 }
 
 void
+rb_enc_raise(rb_encoding *enc, VALUE exc, const char *fmt, ...)
+{
+    va_list args;
+    VALUE mesg;
+
+    va_start(args, fmt);
+    mesg = rb_enc_vsprintf(enc, fmt, args);
+    va_end(args);
+
+    rb_exc_raise(rb_exc_new3(exc, mesg));
+}
+
+void
 rb_raise(VALUE exc, const char *fmt, ...)
 {
     va_list args;
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index 4a046af..e5f0c2a 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -111,6 +111,8 @@ VALUE rb_str_export_to_enc(VALUE, rb_encoding *);
 VALUE rb_str_conv_enc(VALUE str, rb_encoding *from, rb_encoding *to);
 VALUE rb_str_conv_enc_opts(VALUE str, rb_encoding *from, rb_encoding *to, int ecflags, VALUE ecopts);
 
+PRINTF_ARGS(NORETURN(void rb_enc_raise(rb_encoding *, VALUE, const char*, ...)), 3, 4);
+
 /* index -> rb_encoding */
 rb_encoding* rb_enc_from_index(int idx);