diff --git a/constants.py b/constants.py
index 307b0f2..8e1d9cd 100644
--- a/constants.py
+++ b/constants.py
@@ -23,7 +23,8 @@ DEPRECATED = {
     r'\st': r'^{\ast}',
     r'\Tens': r'\tensor',
     r'\ann': r'\Ann',
-    r'\Id': r'\id'
+    r'\Id': r'\id',
+    r'\cat': r'\mathcat'
 }
 
 UNICODE = {