diff --git a/index.js b/index.js
index 1f50178..0958d8f 100644
--- a/index.js
+++ b/index.js
@@ -26,7 +26,9 @@ function evaluateScript(redis, script_name, keys, args, callback) {
   }
 
   readScript(script_name, function (err, script) {
-    if (err) return err;
+    if (err) {
+      return callback(err)
+    }
 
     var sha = shaify(script);
     checkLoaded(redis, script_name, sha, function (err, exists) {
@@ -99,4 +101,4 @@ function loadScript(redis, script_name, script, callback) {
       shas[script_name] = sha1 && sha1.length && sha1[0];
       callback(null, sha1);
     });
-}
\ No newline at end of file
+}