diff --git a/CDL.java b/CDL.java
index 8520e862d..79ce8635d 100755
--- a/CDL.java
+++ b/CDL.java
@@ -143,7 +143,8 @@ public static JSONObject rowToJSONObject(JSONArray names, JSONTokener x)
      */
     public static String rowToString(JSONArray ja) {
         StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < ja.length(); i += 1) {
+        int jsonArrayLength  = ja.length();
+        for (int i = 0; i < jsonArrayLength; i += 1) {
             if (i > 0) {
                 sb.append(',');
             }