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-rw-r--r--tvix/glue/src/builtins/derivation.rs4
1 files changed, 2 insertions, 2 deletions
diff --git a/tvix/glue/src/builtins/derivation.rs b/tvix/glue/src/builtins/derivation.rs
index 473aa9d5e315..b17b90466965 100644
--- a/tvix/glue/src/builtins/derivation.rs
+++ b/tvix/glue/src/builtins/derivation.rs
@@ -347,9 +347,9 @@ pub(crate) mod derivation_builtins {
                             input_context.mimic(&val_str);
 
                             if arg_name == "builder" {
-                                drv.builder = val_str.to_str()?.to_owned();
+                                val_str.to_str()?.clone_into(&mut drv.builder);
                             } else {
-                                drv.system = val_str.to_str()?.to_owned();
+                                val_str.to_str()?.clone_into(&mut drv.system);
                             }
 
                             // Either populate drv.environment or structured_attrs.