diff --git a/ext/gdbm/gdbm.c b/ext/gdbm/gdbm.c
index 4a6377b..bfa6ba4 100644
--- a/ext/gdbm/gdbm.c
+++ b/ext/gdbm/gdbm.c
@@ -463,14 +463,6 @@ fgdbm_key(VALUE obj, VALUE valstr)
     return Qnil;
 }
 
-/* :nodoc: */
-static VALUE
-fgdbm_index(VALUE obj, VALUE value)
-{
-    rb_warn("GDBM#index is deprecated; use GDBM#key");
-    return fgdbm_key(obj, value);
-}
-
 /*
  * call-seq:
  *      gdbm.select { |key, value| block } -> array
@@ -1239,7 +1231,6 @@ Init_gdbm(void)
     rb_define_method(rb_cGDBM, "fetch", fgdbm_fetch_m, -1);
     rb_define_method(rb_cGDBM, "[]=", fgdbm_store, 2);
     rb_define_method(rb_cGDBM, "store", fgdbm_store, 2);
-    rb_define_method(rb_cGDBM, "index",  fgdbm_index, 1);
     rb_define_method(rb_cGDBM, "key",  fgdbm_key, 1);
     rb_define_method(rb_cGDBM, "select",  fgdbm_select, 0);
     rb_define_method(rb_cGDBM, "values_at",  fgdbm_values_at, -1);