diff --git a/src/pip/_internal/vcs/mercurial.py b/src/pip/_internal/vcs/mercurial.py
index bc4b19c7294..d9b58cfe9a4 100644
--- a/src/pip/_internal/vcs/mercurial.py
+++ b/src/pip/_internal/vcs/mercurial.py
@@ -147,6 +147,7 @@ def controls_location(cls, location):
                 show_stdout=False,
                 on_returncode='raise',
                 log_failed_cmd=False)
+            return True
         except (BadCommand, InstallationError):
             return False