diff --git a/Lib/perl5/noembed.h b/Lib/perl5/noembed.h
index 3f1c8df58..256168571 100644
--- a/Lib/perl5/noembed.h
+++ b/Lib/perl5/noembed.h
@@ -52,9 +52,6 @@
 #ifdef ref
   #undef ref
 #endif
-#ifdef ENTER
-  #undef ENTER
-#endif
 #ifdef read
   #undef read
 #endif