--- a/mobile/android/app/checkstyle.xml
+++ b/mobile/android/app/checkstyle.xml
@@ -35,15 +35,16 @@
 
     <!-- TODO: <property name="fileExtensions" value="java, properties, xml"/> -->
 
     <module name="FileTabCharacter"> <!-- No tabs! -->
         <property name="eachLine" value="true"/>
     </module>
 
     <module name="TreeWalker">
+        <module name="GenericWhitespace"/> <!-- whitespace for generics -->
         <module name="NoLineWrap">
             <property name="tokens" value="IMPORT,PACKAGE_DEF"/>
         </module>
         <module name="OuterTypeFilename"/> <!-- `class Lol` only in Lol.java -->
     </module>
 
 </module>

--- a/mobile/android/base/java/org/mozilla/gecko/tabs/TabHistoryController.java
+++ b/mobile/android/base/java/org/mozilla/gecko/tabs/TabHistoryController.java
@@ -22,17 +22,17 @@ public class TabHistoryController {
 
     public static enum HistoryAction {
         ALL,
         BACK,
         FORWARD
     };
 
     public interface OnShowTabHistory {
-        void onShowHistory(List<TabHistoryPage>historyPageList, int toIndex);
+        void onShowHistory(List<TabHistoryPage> historyPageList, int toIndex);
     }
 
     public TabHistoryController(OnShowTabHistory showTabHistoryListener) {
         this.showTabHistoryListener = showTabHistoryListener;
     }
 
     /**
      * This method will show the history for the current tab.