1 files changed, 6 insertions, 6 deletions
diff --git a/error.c b/error.c
index 93093e0e0f..6ebc927853 100644
--- a/error.c
+++ b/error.c
@@ -488,14 +488,14 @@ static VALUE
 exc_backtrace(exc)
     VALUE exc;
 {
-    ID bt = rb_intern("bt");
+    static ID bt;
 
-    if (!rb_ivar_defined(exc, bt)) return Qnil;
-    return rb_ivar_get(exc, bt);
+    if (!bt) bt = rb_intern("bt");
+    return rb_attr_get(exc, bt);
 }
 
-static VALUE
-check_backtrace(bt)
+VALUE
+rb_check_backtrace(bt)
     VALUE bt;
 {
     long i;
@@ -532,7 +532,7 @@ exc_set_backtrace(exc, bt)
     VALUE exc;
     VALUE bt;
 {
-    return rb_iv_set(exc, "bt", check_backtrace(bt));
+    return rb_iv_set(exc, "bt", rb_check_backtrace(bt));
 }
 
 /*