diff --git a/src/mol-io/common/binary-cif/decoder.ts b/src/mol-io/common/binary-cif/decoder.ts
index 3dc694beaca9624432105d08d1770e0da9ae6df9..e9720e52fd6d36570a4eb59162124f62c9f165e5 100644
--- a/src/mol-io/common/binary-cif/decoder.ts
+++ b/src/mol-io/common/binary-cif/decoder.ts
@@ -206,8 +206,8 @@ function stringArray(data: Uint8Array, encoding: Encoding.StringArray) {
 
     let offset = 0;
     const result = new Array(indices.length);
-    for (const i of indices) {
-        result[offset++] = strings[i + 1];
+    for (let i = 0, _i = indices.length; i < _i; i++) {
+        result[offset++] = strings[indices[i] + 1];
     }
     return result;
 }
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