diff --git a/lib/wrench.js b/lib/wrench.js
index 1ddd91d..9e23b75 100644
--- a/lib/wrench.js
+++ b/lib/wrench.js
@@ -267,6 +267,10 @@ var mkdirSyncRecursive = function(path, mode) {
     } catch(err) {
         if(err.code == "ENOENT") {
             var slashIdx = path.lastIndexOf("/");
+            if(slashIdx < 0) {
+                slashIdx = path.lastIndexOf("\\");
+            }
+
             if(slashIdx > 0) {
                 var parentPath = path.substring(0, slashIdx);
                 mkdirSyncRecursive(parentPath, mode);