Homogenize drive letter casing for both prefixes and filenames.

2 files changed, 4 insertions, 0 deletions

diff --git a/docs/changes.rst b/docs/changes.rst
index 6e09b7d..d1ac5d5 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -4,6 +4,7 @@ Release History
 14.1.0 (unreleased)
 -------------------
 
+* Homogenize drive letter casing for both prefixes and filenames. :issue:`858`
 
 14.0.4 (2016-01-31)
 -------------------
diff --git a/virtualenv.py b/virtualenv.py
index 8fb53f6..15069e8 100755
--- a/virtualenv.py
+++ b/virtualenv.py
@@ -981,6 +981,9 @@ def change_prefix(filename, dst_prefix):
     # On Windows, make sure drive letter is uppercase
     if is_win and filename[0] in 'abcdefghijklmnopqrstuvwxyz':
         filename = filename[0].upper() + filename[1:]
+    for i, prefix in enumerate(prefixes):
+        if is_win and prefix[0] in 'abcdefghijklmnopqrstuvwxyz':
+            prefixes[i] = prefix[0].upper() + prefix[1:]
     for src_prefix in prefixes:
         if filename.startswith(src_prefix):
             _, relpath = filename.split(src_prefix, 1)