diff --git a/global_macros b/global_macros
index b4a934d..62d5934 100644
--- a/global_macros
+++ b/global_macros
@@ -41,7 +41,7 @@
 
 #####################################
 # Common socket permission sets.
-define(`rw_socket_perms', `{ ioctl read getattr write setattr append bind connect getopt setopt shutdown }')
+define(`rw_socket_perms', `{ ioctl read getattr write setattr lock append bind connect getopt setopt shutdown }')
 define(`create_socket_perms', `{ create rw_socket_perms }')
 define(`rw_stream_socket_perms', `{ rw_socket_perms listen accept }')
 define(`create_stream_socket_perms', `{ create rw_stream_socket_perms }')