diff --git a/src/main/java/hudson/matrix/MatrixProject.java b/src/main/java/hudson/matrix/MatrixProject.java
index 13841455..b3afa3db 100644
--- a/src/main/java/hudson/matrix/MatrixProject.java
+++ b/src/main/java/hudson/matrix/MatrixProject.java
@@ -108,9 +108,7 @@
 
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
-import org.kohsuke.stapler.AncestorInPath;
 import org.kohsuke.stapler.HttpResponse;
-import org.kohsuke.stapler.QueryParameter;
 import org.kohsuke.stapler.StaplerRequest2;
 import org.kohsuke.stapler.StaplerResponse2;
 import org.kohsuke.stapler.TokenList;
@@ -1127,11 +1125,6 @@ public List<AxisDescriptor> getAxisDescriptors() {
             return r;
         }
 
-        @Restricted(NoExternalUse.class)
-        public FormValidation doCheckDisplayNameOrNull(@AncestorInPath MatrixProject job, @QueryParameter String value) {
-            return Jenkins.get().doCheckDisplayName(value, job.getName());
-        }
-
         /**
          * @deprecated as of 1.456
          *      This was only exposed for Jelly.