diff --git a/tools/export/iar/iar_definitions.json b/tools/export/iar/iar_definitions.json
index 37b622a535..39631e98f9 100644
--- a/tools/export/iar/iar_definitions.json
+++ b/tools/export/iar/iar_definitions.json
@@ -278,8 +278,5 @@
         "OGChipSelectEditMenu": "TMPM46BF10FG\tToshiba TMPM46BF10FG",
         "GFPUCoreSlave": 21,
         "GBECoreSlave": 21
-    },
-    "M2351KIAAEES": {
-        "OGChipSelectEditMenu": "M2351 series\tNuvoton M2351 series"
     }
 }