--- a/mobile/android/base/java/org/mozilla/gecko/promotion/ReaderViewBookmarkPromotion.java
+++ b/mobile/android/base/java/org/mozilla/gecko/promotion/ReaderViewBookmarkPromotion.java
@@ -36,17 +36,17 @@ public class ReaderViewBookmarkPromotion
     }
 
     @Override
     public void onTabChanged(Tab tab, Tabs.TabEvents msg, String data) {
         switch (msg) {
             case LOCATION_CHANGE:
                 // old url: data
                 // new url: tab.getURL()
-                final boolean enteringReaderMode = ReaderModeUtils.isEnteringReaderMode(tab.getURL(), data);
+                final boolean enteringReaderMode = ReaderModeUtils.isEnteringReaderMode(data, tab.getURL());
 
                 if (!hasEnteredReaderMode && enteringReaderMode) {
                     hasEnteredReaderMode = true;
                     promoteBookmarking();
                 }
 
                 break;
         }