From d7e227f65cb6824b05d4ea22637b94cf9fda40e6 Mon Sep 17 00:00:00 2001
From: Kenneth Reitz <me@kennethreitz.org>
Date: Tue, 13 Mar 2018 08:06:45 -0400
Subject: [PATCH] fix #1698

---
 pipenv/core.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pipenv/core.py b/pipenv/core.py
index 16e947f5..82d30ae2 100644
--- a/pipenv/core.py
+++ b/pipenv/core.py
@@ -1063,7 +1063,8 @@ def do_lock(verbose=False, system=False, clear=False, pre=False, keep_outdated=F
             sys.exit(1)
         cached_lockfile = project.lockfile_content
 
-    project.destroy_lockfile()
+    if write:
+        project.destroy_lockfile()
 
     if write:
         # Alert the user of progress.