diff --git a/cli/src/repl/eval.rs b/cli/src/repl/eval.rs
index a430f74f4d..51c1add683 100644
--- a/cli/src/repl/eval.rs
+++ b/cli/src/repl/eval.rs
@@ -243,7 +243,6 @@ fn struct_to_ast<'a>(
     let arena = env.arena;
     let subs = env.subs;
     let mut output = Vec::with_capacity_in(field_layouts.len(), &arena);
-    let mut field_ptr = ptr;
 
     // The fields, sorted alphabetically
     let sorted_fields = {
@@ -258,6 +257,9 @@ fn struct_to_ast<'a>(
 
     debug_assert_eq!(sorted_fields.len(), field_layouts.len());
 
+    // We'll advance this as we iterate through the fields
+    let mut field_ptr = ptr;
+
     for ((label, field), field_layout) in sorted_fields.iter().zip(field_layouts.iter()) {
         let content = subs.get_without_compacting(*field.as_inner()).content;
         let loc_expr = &*arena.alloc(Located {