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-rw-r--r--tvix/eval/src/value/list.rs8
1 files changed, 7 insertions, 1 deletions
diff --git a/tvix/eval/src/value/list.rs b/tvix/eval/src/value/list.rs
index 236a654ad88d..da8f70caacaf 100644
--- a/tvix/eval/src/value/list.rs
+++ b/tvix/eval/src/value/list.rs
@@ -1,5 +1,5 @@
 //! This module implements Nix lists.
-use std::ops::Deref;
+use std::ops::{Deref, DerefMut};
 
 use crate::errors::ErrorKind;
 use crate::vm::VM;
@@ -135,3 +135,9 @@ impl Deref for NixList {
         &self.0
     }
 }
+
+impl DerefMut for NixList {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}