diff --git a/src/rba/rba/rba.cc b/src/rba/rba/rba.cc
index 79813e862..75ccdab25 100644
--- a/src/rba/rba/rba.cc
+++ b/src/rba/rba/rba.cc
@@ -2270,6 +2270,7 @@ RubyInterpreter::begin_exec ()
 {
   d->exit_on_next = false;
   d->block_exceptions = false;
+  d->file_id_map.clear ();
   if (d->current_exec_level++ == 0 && d->current_exec_handler) {
     d->current_exec_handler->start_exec (this);
   }