diff --git a/thunderbird.spec b/thunderbird.spec
index 1ffe8aa..bcfe388 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -20,6 +20,10 @@ function dist_to_rhel_minor(str, start)
   if match then
      return 5
   end
+  match = string.match(str, ".el9")
+  if match then
+     return 4
+  end
   return -1
 end}