1 files changed, 3 insertions, 0 deletions
diff --git a/vm.c b/vm.c
index 69d57913a4..eb60d3792d 100644
--- a/vm.c
+++ b/vm.c
@@ -440,6 +440,9 @@ bool ruby_vm_keep_script_lines;
 
 #ifdef RB_THREAD_LOCAL_SPECIFIER
 RB_THREAD_LOCAL_SPECIFIER rb_execution_context_t *ruby_current_ec;
+#ifdef RUBY_NT_SERIAL
+RB_THREAD_LOCAL_SPECIFIER rb_atomic_t ruby_nt_serial;
+#endif
 
 #ifdef __APPLE__
   rb_execution_context_t *