diff --git a/tools/tracing/rtla/tests/scripts/lib/get_workload_pids.sh b/tools/tracing/rtla/tests/scripts/lib/get_workload_pids.sh
index 8aff98cd2c1f..d10a4e3b321d 100644
--- a/tools/tracing/rtla/tests/scripts/lib/get_workload_pids.sh
+++ b/tools/tracing/rtla/tests/scripts/lib/get_workload_pids.sh
@@ -5,7 +5,7 @@ get_workload_pids() {
     local rtla_pid=$(ps -o ppid= $shell_pid)
 
     # kernel threads
-    pgrep -P $(pgrep ^kthreadd$) -f '^(osnoise|timerlat)/[0-9]+$'
+    pgrep -P $(pgrep ^kthreadd$) -f '^\[?(osnoise|timerlat)/[0-9]+\]?$'
     # user threads
     pgrep -P $rtla_pid | grep -v "^$shell_pid$"
 }