diff --git a/private/system_server.te b/private/system_server.te
index d2a0c5e..e2b5720 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -641,6 +641,10 @@
 
   # Allow system server to read dmesg
   allow system_server kernel:system syslog_read;
+
+  # Allow writing window traces in /data/misc/wmtrace.
+  allow system_server wm_trace_data_file:dir rw_dir_perms;
+  allow system_server wm_trace_data_file:file { getattr setattr create w_file_perms };
 ')
 
 # For AppFuse.