diff --git a/dictsource/ar_rules b/dictsource/ar_rules
index e1cd8fe8..73037aba 100644
--- a/dictsource/ar_rules
+++ b/dictsource/ar_rules
@@ -144,7 +144,7 @@
 
 .group ت
          ت           t
-         ت (_        at
+         ت (_        t
          ت (L20ّ      t:
       _) ت (َP1       t
          ت (ّ         t: