diff --git a/vm_eval.c b/vm_eval.c
index 2cb04af5b2..222389ec08 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1294,7 +1294,7 @@ eval_make_iseq(VALUE src, VALUE fname, int line, const rb_binding_t *bind,
 	rb_parser_warn_location(parser, TRUE);
     }
     else {
-	fname = rb_fstring_lit("(eval)");
+        fname = rb_fstring_lit("(eval)");
     }
 
     rb_parser_set_context(parser, base_block, FALSE);