diff --git a/pipenv/core.py b/pipenv/core.py
index deb7693c..84cd67a7 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -818,8 +818,8 @@ def do_install_dependencies(
         # Additional package selectors, specific to pip's --hash checking mode.
         for l in (deps_list, dev_deps_list):
             for i, dep in enumerate(l):
+                l[i] = list(l[i])
                 if '--hash' in l[i][0]:
-                    l[i] = list(l[i])
                     l[i][0] = (l[i][0].split('--hash')[0].strip())
 
         # Output only default dependencies