diff --git a/index.js b/index.js
index 6ce241b..2f12870 100644
--- a/index.js
+++ b/index.js
@@ -31,6 +31,7 @@ function mkdirP (p, opts, f, made) {
         }
         switch (er.code) {
             case 'ENOENT':
+                if (path.dirname(p) === p) return cb(er);
                 mkdirP(path.dirname(p), opts, function (er, made) {
                     if (er) cb(er, made);
                     else mkdirP(p, opts, cb, made);