1 files changed, 1 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index 59fe9c378b..cac306671b 100644
--- a/eval.c
+++ b/eval.c
@@ -7732,6 +7732,7 @@ Init_Proc()
 
     rb_eSysStackError = rb_define_class("SystemStackError", rb_eStandardError);
     sysstack_error = rb_exc_new2(rb_eSysStackError, "stack level too deep");
+    OBJ_TAINT(sysstack_error);
     rb_global_variable(&sysstack_error);
 
     rb_cProc = rb_define_class("Proc", rb_cObject);