diff --git a/src/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java b/src/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
index d222440c4..98f70d35a 100644
--- a/src/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
+++ b/src/org/fdroid/fdroid/views/fragments/AvailableAppsFragment.java
@@ -54,7 +54,7 @@ public class AvailableAppsFragment extends AppListFragment implements
 
     private class CategoryObserver extends ContentObserver {
 
-        private ArrayAdapter adapter;
+        private ArrayAdapter<String> adapter;
 
         public CategoryObserver(ArrayAdapter<String> adapter) {
             super(null);