diff --git a/news/4881.bugfix.rst b/news/4881.bugfix.rst
new file mode 100644
index 0000000000..11f2eecad9
--- /dev/null
+++ b/news/4881.bugfix.rst
@@ -0,0 +1 @@
+Fix a bug of installation fails when extra index url is given.
diff --git a/pipenv/core.py b/pipenv/core.py
index b67439f87d..52134bf6d7 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -2108,7 +2108,7 @@ def do_install(
                     )
                 ))
                 # Add the package to the Pipfile.
-                indexes = list(filter(None, [index_url, extra_index_url]))
+                indexes = list(filter(None, [index_url, *extra_index_url]))
                 for index in indexes:
                     index_name = project.add_index_to_pipfile(
                         index, verify_ssl=index.startswith("https:")