diff --git a/bumblebee_status/modules/contrib/thunderbird.py b/bumblebee_status/modules/contrib/thunderbird.py
index 1a658044..494ff427 100644
--- a/bumblebee_status/modules/contrib/thunderbird.py
+++ b/bumblebee_status/modules/contrib/thunderbird.py
@@ -63,7 +63,7 @@ def __getThunderbirdStream(self):
         cmd = (
             "find "
             + self.__home
-            + " -name '*.msf' -exec grep -REo '\^A1=[0-9a-fA-F]+)' {} + | grep"
+            + " -name '*.msf' -exec grep -aREo '\^A1=[0-9a-fA-F]+)' {} + | grep"
         )
         for inbox in self.__inboxes:
             cmd += " -e {}".format(inbox)