1 files changed, 2 insertions, 1 deletions
diff --git a/vm_eval.c b/vm_eval.c
index 0dcbafad21..ce7057476c 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1015,7 +1015,8 @@ eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *cref, const char
 	th->base_block = 0;
 
 	if (0) {		/* for debug */
-	    printf("%s\n", RSTRING_PTR(rb_iseq_disasm(iseqval)));
+	    VALUE disasm = rb_iseq_disasm(iseqval);
+	    printf("%s\n", StringValuePtr(disasm));
 	}
 
 	/* save new env */