diff --git a/Boundaries/IST/IST.json b/Boundaries/IST/IST.json
index ab3b88cf..f1fb925e 100644
--- a/Boundaries/IST/IST.json
+++ b/Boundaries/IST/IST.json
@@ -3,7 +3,7 @@
   "properties": {
     "id": "IST",
     "prefix": [
-      "LTBA"
+      "IST"
     ],
     "suffix": "APP",
     "name": "Yesilkoy Approach/Radar"
@@ -201,4 +201,4 @@
       ]
     ]
   }
-}
\ No newline at end of file
+}