diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index 04eb05f..d99567f 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Mar 17 14:52:39 UTC 2022 - Dirk Müller <dmueller@suse.com>
+
+- exclude slow cpus for building 
+
 -------------------------------------------------------------------
 Thu Mar 17 09:18:01 UTC 2022 - Martin Sirringhaus <martin.sirringhaus@suse.com>
 
diff --git a/_constraints b/_constraints
index 3abe8d2..7e9e671 100644
--- a/_constraints
+++ b/_constraints
@@ -9,6 +9,7 @@
       <size unit="G">15</size>
     </physicalmemory>
   </hardware>
+  <hostlabel exclude="true">SLOW_CPU</hostlabel>
   <overwrite>
     <conditions>
       <arch>armv6l</arch>