diff --git a/build/gen_stub.php b/build/gen_stub.php
index 87a2ea76f24..263151a2dff 100755
--- a/build/gen_stub.php
+++ b/build/gen_stub.php
@@ -898,8 +898,6 @@ interface VariableLikeName {
 
 abstract class AbstractConstName implements VariableLikeName
 {
-    abstract public function isClassConst(): bool;
-
     public function isUnknown(): bool
     {
         return strtolower($this->__toString()) === "unknown";
@@ -917,11 +915,6 @@ class ConstName extends AbstractConstName {
         $this->const = $const;
     }
 
-    public function isClassConst(): bool
-    {
-        return false;
-    }
-
     public function isUnknown(): bool
     {
         $name = $this->__toString();
@@ -952,11 +945,6 @@ class ClassConstName extends AbstractConstName {
         $this->const = $const;
     }
 
-    public function isClassConst(): bool
-    {
-        return true;
-    }
-
     public function __toString(): string
     {
         return $this->class->toString() . "::" . $this->const;
@@ -2810,7 +2798,7 @@ class ConstInfo extends VariableLike
 
         // Condition will be added by generateCodeWithConditions()
 
-        if ($this->name->isClassConst()) {
+        if ($this->name instanceof ClassConstName) {
             $code = $this->getClassConstDeclaration($value, $allConstInfos);
         } else {
             $code = $this->getGlobalConstDeclaration($value);
@@ -6388,7 +6376,7 @@ if ($generateOptimizerInfo) {
 
 if ($verifyManual) {
     foreach ($undocumentedConstMap as $constName => $info) {
-        if ($info->name->isClassConst() || $info->isUndocumentable) {
+        if ($info->name instanceof ClassConstName || $info->isUndocumentable) {
             continue;
         }