1 files changed, 3 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index f545a5377d..6e5c8e89ff 100644
--- a/thread.c
+++ b/thread.c
@@ -4979,6 +4979,9 @@ static void
 terminate_atfork_i(rb_thread_t *th, const rb_thread_t *current_th)
 {
     if (th != current_th) {
+        // Clear the scheduler as it is no longer operational:
+        th->scheduler = Qnil;
+
         rb_native_mutex_initialize(&th->interrupt_lock);
         rb_mutex_abandon_keeping_mutexes(th);
         rb_mutex_abandon_locking_mutex(th);