1 files changed, 2 insertions, 1 deletions
diff --git a/re.c b/re.c
index f2e755e01a..053526de09 100644
--- a/re.c
+++ b/re.c
@@ -2311,7 +2311,8 @@ rb_set_kcode(const char *code)
 static void
 kcode_setter(VALUE val)
 {
-    rb_warning("$= no longer effective");
+    may_need_recompile = 1;
+    rb_set_kcode(StringValuePtr(val));
 }
 
 static VALUE