diff --git a/oled.js b/oled.js
index 2b8e2bd..838fa61 100644
--- a/oled.js
+++ b/oled.js
@@ -153,7 +153,7 @@ Oled.prototype._waitUntilReady = function(callback) {
     });
   }
 
-  setTimeout(tick(callback), 0);
+  setTimeout(() => { tick(callback) }, 0);
 };
 
 // set starting position of a text string on the oled