diff --git a/pipenv/core.py b/pipenv/core.py
index e42f184d1..02f8994de 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -791,6 +791,12 @@ def batch_install_iteration(
         strip_extras_markers_from_requirement,
     )
 
+    # Gentoo patch: install dependencies into the venv even if they exist in the system
+    # This is needed because pipenv imports the system packages to run.
+    # It does not change your system's packages.
+    if (extra_pip_args is not None) and ("-I" not in extra_pip_args):
+        extra_pip_args.append("-I")
+
     is_artifact = False
     for dep in deps_to_install:
         if dep.req.req: