diff --git a/news/4642.bugfix.rst b/news/4642.bugfix.rst
new file mode 100644
index 0000000000..7a102c7fec
--- /dev/null
+++ b/news/4642.bugfix.rst
@@ -0,0 +1 @@
+Fix bug preventing use of pipenv lock --pre
diff --git a/pipenv/utils.py b/pipenv/utils.py
index abf7b13af0..61e5f683c7 100644
--- a/pipenv/utils.py
+++ b/pipenv/utils.py
@@ -705,6 +705,8 @@ def prepare_pip_args(self, use_pep517=False, build_isolation=True):
             pip_args.append("--no-use-pep517")
         if build_isolation is False:
             pip_args.append("--no-build-isolation")
+        if self.pre:
+            pip_args.append("--pre")
         pip_args.extend(["--cache-dir", environments.PIPENV_CACHE_DIR])
         return pip_args