1 files changed, 1 insertions, 0 deletions
diff --git a/iseq.h b/iseq.h
index 315a73f3c7..f796905470 100644
--- a/iseq.h
+++ b/iseq.h
@@ -61,6 +61,7 @@ struct rb_compile_option_struct {
     int instructions_unification;
     int stack_caching;
     int trace_instruction;
+    int frozen_string_literal;
     int debug_level;
 };