diff --git a/dictsource/ar_rules b/dictsource/ar_rules
index c373a54b..fd687332 100644
--- a/dictsource/ar_rules
+++ b/dictsource/ar_rules
@@ -230,11 +230,11 @@
          ذْ           D
 
 .group ر
-         ر           r
-         ر (_        r
-         رّ           r:
-         رّْ           r:
-         رْ           r
+         ر           R
+         ر (_        R
+         رّ           R:
+         رّْ           R:
+         رْ           R
 
 .group ز
          ز           z