1 files changed, 3 insertions, 0 deletions
diff --git a/iseq.h b/iseq.h
index fafa5a518e..96d19029a1 100644
--- a/iseq.h
+++ b/iseq.h
@@ -11,6 +11,7 @@
 
 **********************************************************************/
 #include "internal/gc.h"
+#include "shape.h"
 #include "vm_core.h"
 
 RUBY_EXTERN const int ruby_api_version[];
@@ -325,6 +326,8 @@ VALUE rb_iseq_defined_string(enum defined_type type);
 /* vm.c */
 VALUE rb_iseq_local_variables(const rb_iseq_t *iseq);
 
+attr_index_t rb_estimate_iv_count(VALUE klass, const rb_iseq_t * initialize_iseq);
+
 RUBY_SYMBOL_EXPORT_END
 
 #endif /* RUBY_ISEQ_H */