diff --git a/README.md b/README.md
index a8f251db..f22c6776 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,10 @@ Or, if you\'re using FreeBSD:
 
     # pkg install py36-pipenv
 
+When none of the above is an option:
+
+    $ pip install pipenv
+
 Otherwise, refer to the [documentation](https://pipenv.pypa.io/en/latest/#install-pipenv-today) for instructions.
 
 ✨🍰✨
diff --git a/news/4199.behavior.rst b/news/4199.behavior.rst
new file mode 100644
index 00000000..eb1dae3c
--- /dev/null
+++ b/news/4199.behavior.rst
@@ -0,0 +1 @@
+Make sure `pipenv lock -r --pypi-mirror {MIRROR_URL}` will respect the pypi-mirror in requirements output.
diff --git a/pipenv/core.py b/pipenv/core.py
index e71ec5d8..ec2a9b80 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -796,7 +796,7 @@ def do_install_dependencies(
     skip_lock=False,
     concurrent=True,
     requirements_dir=None,
-    pypi_mirror=False,
+    pypi_mirror=None,
 ):
     """"
     Executes the install functionality.
@@ -830,7 +830,7 @@ def do_install_dependencies(
     no_deps = not skip_lock  # skip_lock true, no_deps False, pip resolves deps
     deps_list = list(lockfile.get_requirements(dev=dev, only=requirements))
     if requirements:
-        index_args = prepare_pip_source_args(project.sources)
+        index_args = prepare_pip_source_args(get_source_list(pypi_mirror=pypi_mirror, project=project))
         index_args = " ".join(index_args).replace(" -", "\n-")
         deps = [
             req.as_line(sources=False, include_hashes=False) for req in deps_list
diff --git a/pipenv/environments.py b/pipenv/environments.py
index 79f66019..848fec87 100644
--- a/pipenv/environments.py
+++ b/pipenv/environments.py
@@ -247,7 +247,11 @@ PIP_EXISTS_ACTION = os.environ.get("PIP_EXISTS_ACTION", "w")
 Defaullts to (w)ipe
 """
 
-PIPENV_RESOLVE_VCS = _is_env_truthy(os.environ.get("PIPENV_RESOLVE_VCS", 'true'))
+PIPENV_RESOLVE_VCS = (
+    os.environ.get("PIPENV_RESOLVE_VCS") is None
+    or _is_env_truthy("PIPENV_RESOLVE_VCS")
+)
+
 """Tells Pipenv whether to resolve all VCS dependencies in full.
 
 As of Pipenv 2018.11.26, only editable VCS dependencies were resolved in full.
diff --git a/tests/integration/test_lock.py b/tests/integration/test_lock.py
index 7b81e0be..4f202bea 100644
--- a/tests/integration/test_lock.py
+++ b/tests/integration/test_lock.py
@@ -379,10 +379,8 @@ fake-package = "*"
         assert c.return_code == 0
         c = p.pipenv('lock -r --pypi-mirror {0}'.format(mirror_url))
         assert c.return_code == 0
-        assert '-i https://pypi.org/simple' in c.out.strip()
+        assert '-i {0}'.format(mirror_url) in c.out.strip()
         assert '--extra-index-url https://test.pypi.org/simple' in c.out.strip()
-        # Mirror url should not have replaced source URLs
-        assert '-i {0}'.format(mirror_url) not in c.out.strip()
         assert '--extra-index-url {}'.format(mirror_url) not in c.out.strip()