diff --git a/src/which.js b/src/which.js
index fadb96c..2822ecf 100644
--- a/src/which.js
+++ b/src/which.js
@@ -15,6 +15,10 @@ function splitPath(p) {
     return p.split(':');
 }
 
+function checkPath(path) {
+  return fs.existsSync(path) && fs.statSync(path).isDirectory() == false;
+}
+
 //@
 //@ ### which(command)
 //@
@@ -42,7 +46,7 @@ function _which(options, cmd) {
         return; // already found it
 
       var attempt = path.resolve(dir + '/' + cmd);
-      if (fs.existsSync(attempt)) {
+      if (checkPath(attempt)) {
         where = attempt;
         return;
       }
@@ -50,17 +54,17 @@ function _which(options, cmd) {
       if (common.platform === 'win') {
         var baseAttempt = attempt;
         attempt = baseAttempt + '.exe';
-        if (fs.existsSync(attempt)) {
+        if (checkPath(attempt)) {
           where = attempt;
           return;
         }
         attempt = baseAttempt + '.cmd';
-        if (fs.existsSync(attempt)) {
+        if (checkPath(attempt)) {
           where = attempt;
           return;
         }
         attempt = baseAttempt + '.bat';
-        if (fs.existsSync(attempt)) {
+        if (checkPath(attempt)) {
           where = attempt;
           return;
         }
@@ -69,7 +73,7 @@ function _which(options, cmd) {
   }
 
   // Command not found anywhere?
-  if (!fs.existsSync(cmd) && !where)
+  if (!checkPath(cmd) && !where)
     return null;
 
   where = where || path.resolve(cmd);