diff --git a/ext/v8/v8_weakref.h b/ext/v8/v8_weakref.h
index 9c8ad46..c080fed 100644
--- a/ext/v8/v8_weakref.h
+++ b/ext/v8/v8_weakref.h
@@ -3,7 +3,6 @@
 
 #include <v8.h>
 #include "ruby.h"
-#include "ruby/version.h"
 
 struct v8_weakref  {
   v8_weakref(VALUE object);
@@ -22,9 +21,6 @@ VALUE v8_weakref_objectspace();
 VALUE v8_weakref_nil(VALUE nil, VALUE exception);
 VALUE v8_weakref_id2ref(VALUE id);
 
-
-#if RUBY_VERSION_MAJOR == 1 && RUBY_VERSION_MINOR == 8
 extern "C" VALUE rb_proc_new(VALUE (*)(ANYARGS/* VALUE yieldarg[, VALUE procarg] */), VALUE);
-#endif
 
 #endif