1 files changed, 5 insertions, 0 deletions
diff --git a/lib/path.js b/lib/path.js
index da0f8bee68..db0cdea2dd 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -176,6 +176,11 @@ if (isWindows) {
         tail = result[3],
         trailingSlash = /[\\\/]$/.test(tail);
 
+    // If device is a drive letter, we'll normalize to lower case.
+    if (device && device.charAt(1) === ':') {
+      device = device[0].toLowerCase() + device.substr(1);
+    }
+
     // Normalize the tail path
     tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {
       return !!p;