diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index ff09c6c..8907071 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Mar 17 14:39:51 UTC 2022 - Dirk Müller <dmueller@suse.com>
+
+- skip slow workers, this is a tough build job 
+
 -------------------------------------------------------------------
 Sun Mar  6 13:02:02 UTC 2022 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/_constraints b/_constraints
index 1bbe0c7..6f6a063 100644
--- a/_constraints
+++ b/_constraints
@@ -8,6 +8,7 @@
       <size unit="G">9</size>
     </memory>
   </hardware>
+  <hostlabel exclude="true">SLOW_CPU</hostlabel>
   <overwrite>
     <conditions>
       <arch>armv6l</arch>