diff --git a/lib/path.js b/lib/path.js
index 04187aaf2f4..44ef0d68e25 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -206,7 +206,7 @@ if (isWindows) {
   exports.isAbsolute = function(path) {
     var result = splitDeviceRe.exec(path),
         device = result[1] || '',
-        isUnc = device && device.charAt(1) !== ':';
+        isUnc = !!device && device.charAt(1) !== ':';
     // UNC paths are always absolute
     return !!result[2] || isUnc;
   };