diff --git a/mercurial/statprof.py b/mercurial/statprof.py
--- a/mercurial/statprof.py
+++ b/mercurial/statprof.py
@@ -494,9 +494,9 @@ def display(fp=None, format=3, data=None
         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
diff --git a/tests/test-check-pytype.t b/tests/test-check-pytype.t
--- a/tests/test-check-pytype.t
+++ b/tests/test-check-pytype.t
@@ -32,7 +32,6 @@ mercurial/pure/parsers.py     # [attribu
 mercurial/pycompat.py         # bytes vs str issues
 mercurial/repoview.py         # [attribute-error]
 mercurial/sslutil.py          # [attribute-error]
-mercurial/statprof.py         # bytes vs str on TextIO.write() [wrong-arg-types]
 mercurial/testing/storage.py  # tons of [attribute-error]
 mercurial/ui.py               # [attribute-error], [wrong-arg-types]
 mercurial/unionrepo.py        # ui, svfs, unfiltered [attribute-error]
@@ -72,7 +71,6 @@ development, but may be a hinderance for
   >    -x mercurial/pycompat.py \
   >    -x mercurial/repoview.py \
   >    -x mercurial/sslutil.py \
-  >    -x mercurial/statprof.py \
   >    -x mercurial/testing/storage.py \
   >    -x mercurial/thirdparty \
   >    -x mercurial/ui.py \