diff --git a/riveted.js b/riveted.js
index 1cdfc6c..3a985f8 100644
--- a/riveted.js
+++ b/riveted.js
@@ -46,7 +46,9 @@ var riveted = (function() {
         classicGA = true;
       }
 
-      if (typeof dataLayer !== "undefined" && typeof dataLayer.push === "function") {
+      if (options.googleTagManager) {
+        googleTagManager = options.googleTagManager;
+      } else if (typeof dataLayer !== "undefined" && typeof dataLayer.push === "function") {
         googleTagManager = true;
       }