diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -105,7 +105,7 @@ def load(ui, name, path):
         try:
             mod = _importh("hgext.%s" % name)
         except ImportError as err:
-            _reportimporterror(ui, err, "hgext.%s" % name, name)
+            _reportimporterror(ui, err, "hgext.%s" % name, "hgext3rd.%s" % name)
             try:
                 mod = _importh("hgext3rd.%s" % name)
             except ImportError as err:
diff --git a/tests/test-bad-extension.t b/tests/test-bad-extension.t
--- a/tests/test-bad-extension.t
+++ b/tests/test-bad-extension.t
@@ -53,7 +53,7 @@ show traceback for ImportError of hgext.
   *** failed to import extension badext from $TESTTMP/badext.py: bit bucket overflow
   Traceback (most recent call last):
   Exception: bit bucket overflow
-  could not import hgext.badext2 (No module named *badext2): trying badext2 (glob)
+  could not import hgext.badext2 (No module named *badext2): trying hgext3rd.badext2 (glob)
   Traceback (most recent call last):
   ImportError: No module named *badext2 (glob)
   could not import hgext3rd.badext2 (No module named *badext2): trying badext2 (glob)