1 files changed, 1 insertions, 2 deletions
diff --git a/range.c b/range.c
index 1866df1507..aa5472df06 100644
--- a/range.c
+++ b/range.c
@@ -11,12 +11,11 @@
 
 #include "ruby/ruby.h"
 #include "ruby/encoding.h"
+#include "internal.h"
 
 VALUE rb_cRange;
 static ID id_cmp, id_succ, id_beg, id_end, id_excl;
 
-extern VALUE rb_struct_init_copy(VALUE copy, VALUE s);
-
 #define RANGE_BEG(r) (RSTRUCT(r)->as.ary[0])
 #define RANGE_END(r) (RSTRUCT(r)->as.ary[1])
 #define RANGE_EXCL(r) (RSTRUCT(r)->as.ary[2])