diff --git a/pipenv/core.py b/pipenv/core.py
index 93f45692..ca79536c 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -1440,6 +1440,7 @@ def pip_install(
         "sources": " ".join(prepare_pip_source_args(sources)),
         "src": src,
         "verbose_flag": "--verbose" if verbose else "",
+        "install_reqs": install_reqs
     }
     pip_command = "{quoted_pip} install {pre} {src} {verbose_flag} {upgrade_strategy} {no_deps} {install_reqs} {sources}".format(
         **pip_args