diff --git a/pipenv/patched/pew/pew.py b/pipenv/patched/pew/pew.py
index 07dbdf4f37..038ad886bb 100644
--- a/pipenv/patched/pew/pew.py
+++ b/pipenv/patched/pew/pew.py
@@ -184,7 +184,8 @@ def fork_bash(env, cwd):
 
 def fork_cmder(env, cwd):
     shell_cmd = ['cmd']
-    cmderrc_path = r'%CMDER_ROOT%\vendor\init.bat'
+    escaped_cmder_root = os.environ['CMDER_ROOT'].replace(' ', '^ ')
+    cmderrc_path = r'{0}\vendor\init.bat'.format(escaped_cmder_root)
     if expandpath(cmderrc_path).exists():
         shell_cmd += ['/k', cmderrc_path]
     if cwd:
diff --git a/tasks/vendoring/patches/patched/pew-cmder-root-space-escape-fix.patch b/tasks/vendoring/patches/patched/pew-cmder-root-space-escape-fix.patch
new file mode 100644
index 0000000000..eb0e3d8296
--- /dev/null
+++ b/tasks/vendoring/patches/patched/pew-cmder-root-space-escape-fix.patch
@@ -0,0 +1,14 @@
+diff --git a/pipenv/patched/pew/pew.py b/pipenv/patched/pew/pew.py
+index 2d3889a0..91f313c1 100644
+--- a/pipenv/patched/pew/pew.py
++++ b/pipenv/patched/pew/pew.py
+@@ -184,7 +184,8 @@ def fork_bash(env, cwd):
+ 
+ def fork_cmder(env, cwd):
+     shell_cmd = ['cmd']
+-    cmderrc_path = r'%CMDER_ROOT%\vendor\init.bat'
++    escaped_cmder_root = os.environ['CMDER_ROOT'].replace(' ', '^ ')
++    cmderrc_path = r'{0}\vendor\init.bat'.format(escaped_cmder_root)
+     if expandpath(cmderrc_path).exists():
+         shell_cmd += ['/k', cmderrc_path]
+     if cwd: