diff --git a/billiard/common.py b/billiard/common.py
index 9324d3b..eda0ffb 100644
--- a/billiard/common.py
+++ b/billiard/common.py
@@ -47,7 +47,6 @@
     'SIGQUIT',
     TERM_SIGNAME,
     'SIGUSR1',
-    'SIGUSR2'
 }
 
 TERMSIGS_FULL = {