diff -r c1fe758c1530 -r d2fff292c265 mercurial/statprof.py
--- a/mercurial/statprof.py	Mon Dec 13 17:59:36 2021 -0500
+++ b/mercurial/statprof.py	Mon Dec 13 19:34:06 2021 -0500
@@ -494,9 +494,9 @@
         data = state
 
     if fp is None:
-        import sys
+        from .utils import procutil
 
-        fp = sys.stdout
+        fp = procutil.stdout
     if len(data.samples) == 0:
         fp.write(b'No samples recorded.\n')
         return