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-rw-r--r--tvix/eval/src/builtins/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index c56c53e46581..464809b270e0 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -835,7 +835,7 @@ mod pure_builtins {
     ) -> Result<Value, ErrorKind> {
         let beg = start.as_int()?;
         let len = len.as_int()?;
-        let x = s.to_str()?;
+        let x = s.coerce_to_string(co, CoercionKind::Weak).await?.to_str()?;
 
         if beg < 0 {
             return Err(ErrorKind::IndexOutOfBounds { index: beg });