diff --git a/scripts/wk/hw/cpu.py b/scripts/wk/hw/cpu.py
index 597093ef..e25f75d1 100644
--- a/scripts/wk/hw/cpu.py
+++ b/scripts/wk/hw/cpu.py
@@ -112,9 +112,9 @@ def start_mprime(working_dir, log_path) -> subprocess.Popen:
     stdout=subprocess.PIPE,
     )
   proc_mprime.stdout.close() # type: ignore[reportOptionalMemberAccess]
-  save_nsbr = exe.NonBlockingStreamReader(proc_grep.stdout)
+  save_nbsr = exe.NonBlockingStreamReader(proc_grep.stdout)
   exe.start_thread(
-    save_nsbr.save_to_file,
+    save_nbsr.save_to_file,
     args=(proc_grep, log_path),
     )