1 files changed, 1 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index cc450c5790..da912b5b60 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -285,6 +285,7 @@ typedef struct rb_vm_struct {
     VALUE thgroup_default;
 
     int running;
+    int inhibit_thread_creation;
     int thread_abort_on_exception;
     unsigned long trace_flag;
     volatile int sleeper;