diff --git a/mypy/stubgen.py b/mypy/stubgen.py
index fdad5c2ddd89..b197f4a57123 100755
--- a/mypy/stubgen.py
+++ b/mypy/stubgen.py
@@ -1524,7 +1524,7 @@ def find_module_paths_using_imports(
             except CantImport as e:
                 tb = traceback.format_exc()
                 if verbose:
-                    sys.stdout.write(tb)
+                    sys.stderr.write(tb)
                 if not quiet:
                     report_missing(mod, e.message, tb)
                 continue
diff --git a/mypy/stubutil.py b/mypy/stubutil.py
index c11843c57f2a..8ccf8301ee43 100644
--- a/mypy/stubutil.py
+++ b/mypy/stubutil.py
@@ -5,6 +5,7 @@
 import os.path
 import re
 import sys
+import traceback
 from abc import abstractmethod
 from collections import defaultdict
 from contextlib import contextmanager
@@ -70,6 +71,9 @@ def walk_packages(
         try:
             prop = inspect.get_package_properties(package_name)
         except InspectError:
+            if verbose:
+                tb = traceback.format_exc()
+                sys.stderr.write(tb)
             report_missing(package_name)
             continue
         yield prop.name