1 files changed, 1 insertions, 1 deletions
diff --git a/insns.def b/insns.def
index 7eb322120b..a923d3a4d6 100644
--- a/insns.def
+++ b/insns.def
@@ -370,7 +370,7 @@ concatstrings
     val = rb_str_resurrect(TOPN(i));
     while (i-- > 0) {
 	const VALUE v = TOPN(i);
-	rb_str_append(val, v);
+	rb_str_append_literal(val, v);
     }
     POPN(num);
 }