diff --git a/src/main/java/xyz/zhouxy/plusone/commons/util/PagingAndSortingQueryParams.java b/src/main/java/xyz/zhouxy/plusone/commons/util/PagingAndSortingQueryParams.java
index 85a3514..1c412c6 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/util/PagingAndSortingQueryParams.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/util/PagingAndSortingQueryParams.java
@@ -60,7 +60,6 @@ public class PagingAndSortingQueryParams {
 
     // Getters
 
-    @Nullable
     public final List<String> getOrderBy() {
         return ImmutableList.copyOf(this.orderBy);
     }