1 files changed, 1 insertions, 3 deletions
diff --git a/thread.c b/thread.c
index c11f57b13b..3264548480 100644
--- a/thread.c
+++ b/thread.c
@@ -581,7 +581,6 @@ thread_create_core(VALUE thval, VALUE args, VALUE (*fn)(ANYARGS))
     th->async_errinfo_mask_stack = rb_ary_dup(current_th->async_errinfo_mask_stack);
     RBASIC(th->async_errinfo_mask_stack)->klass = 0;
 
-    th->in_trap = 0;
     th->interrupt_mask = 0;
 
     native_mutex_initialize(&th->interrupt_lock);
@@ -811,7 +810,7 @@ thread_join_m(int argc, VALUE *argv, VALUE self)
     double delay = DELAY_INFTY;
     VALUE limit;
 
-    if (cur_th->in_trap) {
+    if (cur_th->interrupt_mask & 0x08) {
 	rb_raise(rb_eThreadError, "can't be called from trap context");
     }
 
@@ -4813,7 +4812,6 @@ Init_Thread(void)
 	    th->async_errinfo_queue_checked = 0;
 	    th->async_errinfo_mask_stack = rb_ary_tmp_new(0);
 
-	    th->in_trap = 0;
 	    th->interrupt_mask = 0;
 	}
     }