diff --git a/java/com/google/gerrit/server/restapi/change/DeletePrivate.java b/java/com/google/gerrit/server/restapi/change/DeletePrivate.java
index 571c319..092f118 100644
--- a/java/com/google/gerrit/server/restapi/change/DeletePrivate.java
+++ b/java/com/google/gerrit/server/restapi/change/DeletePrivate.java
@@ -16,6 +16,7 @@
 
 import static com.google.gerrit.extensions.conditions.BooleanCondition.or;
 
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.conditions.BooleanCondition;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
@@ -54,7 +55,7 @@
 
   @Override
   protected Response<String> applyImpl(
-      BatchUpdate.Factory updateFactory, ChangeResource rsrc, SetPrivateOp.Input input)
+      BatchUpdate.Factory updateFactory, ChangeResource rsrc, @Nullable SetPrivateOp.Input input)
       throws RestApiException, UpdateException {
     if (!canDeletePrivate(rsrc).value()) {
       throw new AuthException("not allowed to unmark private");
diff --git a/java/com/google/gerrit/server/restapi/change/SetPrivateOp.java b/java/com/google/gerrit/server/restapi/change/SetPrivateOp.java
index 04c94be..3bb297d 100644
--- a/java/com/google/gerrit/server/restapi/change/SetPrivateOp.java
+++ b/java/com/google/gerrit/server/restapi/change/SetPrivateOp.java
@@ -15,6 +15,7 @@
 package com.google.gerrit.server.restapi.change;
 
 import com.google.common.base.Strings;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.ChangeMessage;
@@ -43,14 +44,14 @@
   }
 
   public interface Factory {
-    SetPrivateOp create(ChangeMessagesUtil cmUtil, boolean isPrivate, Input input);
+    SetPrivateOp create(ChangeMessagesUtil cmUtil, boolean isPrivate, @Nullable Input input);
   }
 
-  private final ChangeMessagesUtil cmUtil;
-  private final PatchSetUtil psUtil;
-  private final boolean isPrivate;
-  private final Input input;
   private final PrivateStateChanged privateStateChanged;
+  private final PatchSetUtil psUtil;
+  private final ChangeMessagesUtil cmUtil;
+  private final boolean isPrivate;
+  @Nullable private final Input input;
 
   private Change change;
   private PatchSet ps;
@@ -61,12 +62,12 @@
       PatchSetUtil psUtil,
       @Assisted ChangeMessagesUtil cmUtil,
       @Assisted boolean isPrivate,
-      @Assisted Input input) {
-    this.cmUtil = cmUtil;
+      @Assisted @Nullable Input input) {
+    this.privateStateChanged = privateStateChanged;
     this.psUtil = psUtil;
+    this.cmUtil = cmUtil;
     this.isPrivate = isPrivate;
     this.input = input;
-    this.privateStateChanged = privateStateChanged;
   }
 
   @Override