diff --git a/builtin.h b/builtin.h
index 549343c19d..a31d88b073 100644
--- a/builtin.h
+++ b/builtin.h
@@ -45,7 +45,10 @@ static inline void rb_builtin_function_check_arity15(VALUE (*f)(rb_execution_con
 
 VALUE rb_vm_lvar_exposed(rb_execution_context_t *ec, int index);
 
-// inline
+// __builtin_inline!
+
+PUREFUNC(static inline VALUE rb_vm_lvar(rb_execution_context_t *ec, int index));
+
 static inline VALUE
 rb_vm_lvar(rb_execution_context_t *ec, int index)
 {
diff --git a/pack.c b/pack.c
index a4e0882869..c91531f58d 100644
--- a/pack.c
+++ b/pack.c
@@ -15,7 +15,6 @@
 #include <ctype.h>
 #include <errno.h>
 #include <float.h>
-#include "vm_core.h"
 #include "builtin.h"
 
 /*