1 files changed, 1 insertions, 1 deletions
diff --git a/vm_core.h b/vm_core.h
index a2f6af3c30..d0676ae030 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -642,7 +642,7 @@ typedef struct rb_vm_struct {
 
     /* postponed_job (async-signal-safe, NOT thread-safe) */
     struct rb_postponed_job_struct *postponed_job_buffer;
-    int postponed_job_index;
+    rb_atomic_t postponed_job_index;
 
     int src_encoding_index;