diff --git a/core/src/main/java/hudson/model/AbstractProject.java b/core/src/main/java/hudson/model/AbstractProject.java
index c554ef8134406..cceff9c42b19d 100644
--- a/core/src/main/java/hudson/model/AbstractProject.java
+++ b/core/src/main/java/hudson/model/AbstractProject.java
@@ -1940,11 +1940,6 @@ 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) {