diff --git a/crates/compiler/gen_dev/src/generic64/mod.rs b/crates/compiler/gen_dev/src/generic64/mod.rs
index 923f9b5b72..6232dee6e4 100644
--- a/crates/compiler/gen_dev/src/generic64/mod.rs
+++ b/crates/compiler/gen_dev/src/generic64/mod.rs
@@ -1371,9 +1371,9 @@ impl<
             &Literal::Int((element_width as i128).to_ne_bytes()),
         );
 
-        // Load UpdateMode.InPlace argument (1u8)
+        // Load UpdateMode.Immutable argument (0u8)
         let u8_layout = Layout::U8;
-        let update_mode = 1u8;
+        let update_mode = 0u8;
         self.load_literal(
             &Symbol::DEV_TMP3,
             &u64_layout,