diff --git a/pipenv/project.py b/pipenv/project.py
index 59ba0619fe..c13cf59798 100644
--- a/pipenv/project.py
+++ b/pipenv/project.py
@@ -5,6 +5,7 @@
 import re
 import sys
 import base64
+import fnmatch
 import hashlib
 import contoml
 from first import first
@@ -33,6 +34,7 @@
     safe_expandvars,
     is_star,
     get_workon_home,
+    is_virtual_environment,
 )
 from .environments import (
     PIPENV_MAX_DEPTH,
@@ -273,21 +275,23 @@ def get_name(name, location):
         clean_name, encoded_hash = get_name(name, self.pipfile_location)
         venv_name = "{0}-{1}".format(clean_name, encoded_hash)
 
-        # This should work most of the time, for non-WIndows, in-project venv,
-        # or "proper" path casing (on Windows).
+        # This should work most of the time for
+        #   Case-sensitive filesystems,
+        #   In-project venv
+        #   "Proper" path casing (on non-case-sensitive filesystems).
         if (
-            os.name != "nt"
+            fnmatch.fnmatch('A', 'a')
             or self.is_venv_in_project()
             or self._get_virtualenv_location(venv_name)
         ):
             return clean_name, encoded_hash
 
         # Check for different capitalization of the same project.
-        from .patched.pew.pew import lsenvs
-
-        for env in lsenvs():
+        for path in get_workon_home().iterdir():
+            if not is_virtual_environment(path):
+                continue
             try:
-                env_name, hash_ = env.rsplit("-", 1)
+                env_name, hash_ = path.name.rsplit("-", 1)
             except ValueError:
                 continue
             if len(hash_) != 8 or env_name.lower() != name.lower():
diff --git a/pipenv/utils.py b/pipenv/utils.py
index a490df7a57..74bb22875a 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -1310,7 +1310,6 @@ def fs_str(string):
 _fs_encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
 
 
-# Duplicated from Pew to avoid importing it (performance considerations).
 def get_workon_home():
     from ._compat import Path
 
@@ -1323,3 +1322,19 @@ def get_workon_home():
                 os.environ.get("XDG_DATA_HOME", "~/.local/share"), "virtualenvs"
             )
     return Path(os.path.expandvars(workon_home)).expanduser()
+
+
+def is_virtual_environment(path):
+    """Check if a given path is a virtual environment's root.
+
+    This is done by checking if the directory contains a Python executable in
+    its bin/Scripts directory. Not technically correct, but good enough for
+    general usage.
+    """
+    if not path.is_dir():
+        return False
+    for bindir_name in ('bin', 'Scripts'):
+        for python_like in path.joinpath(bindir_name).glob('python*'):
+            if python_like.is_file() and os.access(str(python_like), os.X_OK):
+                return True
+    return False
diff --git a/setup.cfg b/setup.cfg
index f502548fe8..c2f10f1727 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -11,4 +11,5 @@ ignore =
     # E231: missing whitespace after ','
     # E402: module level import not at top of file
     # E501: line too long
-    E127,E128,E129,E222,E231,E402,E501
+    # W503: line break before binary operator
+    E127,E128,E129,E222,E231,E402,E501,W503