diff --git a/core/src/main/java/hudson/model/AbstractProject.java b/core/src/main/java/hudson/model/AbstractProject.java
index c568f8df8b31..917ff1f7b81f 100644
--- a/core/src/main/java/hudson/model/AbstractProject.java
+++ b/core/src/main/java/hudson/model/AbstractProject.java
@@ -1934,11 +1934,6 @@ public boolean isApplicable(Descriptor descriptor) {
             return true;
         }
 
-        @Restricted(DoNotUse.class)
-        public FormValidation doCheckDisplayNameOrNull(@AncestorInPath AbstractProject project, @QueryParameter String value) {
-            return Jenkins.get().doCheckDisplayName(value, project.getName());
-        }
-
         @Restricted(DoNotUse.class)
         public FormValidation doCheckAssignedLabelString(@AncestorInPath AbstractProject<?, ?> project,
                                                          @QueryParameter String value) {
diff --git a/core/src/main/java/hudson/model/TopLevelItemDescriptor.java b/core/src/main/java/hudson/model/TopLevelItemDescriptor.java
index d2ebe3065349..d84e4a684f22 100644
--- a/core/src/main/java/hudson/model/TopLevelItemDescriptor.java
+++ b/core/src/main/java/hudson/model/TopLevelItemDescriptor.java
@@ -27,6 +27,7 @@
 import edu.umd.cs.findbugs.annotations.CheckForNull;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import hudson.ExtensionList;
+import hudson.util.FormValidation;
 import java.io.StringWriter;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -37,7 +38,11 @@
 import org.jenkins.ui.icon.Icon;
 import org.jenkins.ui.icon.IconSet;
 import org.jenkins.ui.icon.IconSpec;
+import org.kohsuke.accmod.Restricted;
+import org.kohsuke.accmod.restrictions.NoExternalUse;
+import org.kohsuke.stapler.AncestorInPath;
 import org.kohsuke.stapler.MetaClass;
+import org.kohsuke.stapler.QueryParameter;
 import org.kohsuke.stapler.Stapler;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.WebApp;
@@ -286,4 +291,8 @@ public static ExtensionList<TopLevelItemDescriptor> all() {
         return Items.all();
     }
 
+    @Restricted(NoExternalUse.class)
+    public FormValidation doCheckDisplayNameOrNull(@AncestorInPath TopLevelItem item, @QueryParameter String value) {
+        return Jenkins.get().doCheckDisplayName(value, item.getName());
+    }
 }