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-rw-r--r--tvix/nix-compat/src/nar/writer/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/tvix/nix-compat/src/nar/writer/mod.rs b/tvix/nix-compat/src/nar/writer/mod.rs
index aafb26c86dba..f018e4212e80 100644
--- a/tvix/nix-compat/src/nar/writer/mod.rs
+++ b/tvix/nix-compat/src/nar/writer/mod.rs
@@ -37,7 +37,7 @@ use std::io::{
 mod wire;
 
 /// Convenience type alias for types implementing [`Write`].
-pub type Writer<'a> = dyn Write + 'a;
+pub type Writer<'a> = dyn Write + Send + 'a;
 
 /// Create a new NAR, writing the output to the specified writer.
 pub fn open<'a, 'w: 'a>(writer: &'a mut Writer<'w>) -> io::Result<Node<'a, 'w>> {