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-rw-r--r--include/ruby/encoding.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index 50516b3c0a..cbe4f88743 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -51,7 +51,7 @@ rb_encoding* rb_enc_compatible(VALUE,VALUE);
rb_encoding* rb_enc_check(VALUE,VALUE);
void rb_enc_associate_index(VALUE, int);
void rb_enc_associate(VALUE, rb_encoding*);
-void rb_enc_copy(VALUE, VALUE);
+void rb_enc_copy(VALUE dst, VALUE src);
VALUE rb_enc_str_new(const char*, long len, rb_encoding*);
long rb_enc_strlen(const char*, const char*, rb_encoding*);