diff --git a/src/builtin.cmod b/src/builtin.cmod
index e94e1b089e8381047870a32f123ca3a03a485952..7a7ca8afa58380aa205f024a68a1e9e377554b6d 100644
--- a/src/builtin.cmod
+++ b/src/builtin.cmod
@@ -2961,6 +2961,8 @@ PIKEFUN array(mixed) backtrace()
 /*! @module String
  */
 
+#define PROG_BUFFER_ID	PROG_STRING_BUFFER_ID
+
 /*! @class Buffer
  *!    A buffer, used for building strings. It's
  *!    conceptually similar to a string, but you can only @[add]