diff --git a/phpunit/src/Build/CompilerGeneratorFingerprintTest.php b/phpunit/src/Build/CompilerGeneratorFingerprintTest.php
index 6c62361e..9bec87c5 100644
--- a/phpunit/src/Build/CompilerGeneratorFingerprintTest.php
+++ b/phpunit/src/Build/CompilerGeneratorFingerprintTest.php
@@ -21,6 +21,11 @@ final class CompilerGeneratorFingerprintTest extends TestCase
         $method = (new ReflectionClass(\TypePhp\Translator::class))->getMethod('getIncrementalGeneratorFingerprint');
         $native = $method->invoke($compiler);
         self::assertMatchesRegularExpression('/^[a-f0-9]{64}$/D', $native);
+        $reflection = new ReflectionClass($compiler);
+        while (!$reflection->hasProperty('opcodeBuildChecked')) {
+            $reflection = $reflection->getParentClass();
+        }
+        self::assertFalse($reflection->getProperty('opcodeBuildChecked')->getValue($compiler));
         self::assertSame($native, $method->invoke($compiler));
         define('TYPEPHP_PHP_SCRIPT_ENTRY', true);
         self::assertNotSame($native, $method->invoke($compiler));
diff --git a/src/Build/IncrementalCompilationTrait.php b/src/Build/IncrementalCompilationTrait.php
index be5e2697..038220eb 100644
--- a/src/Build/IncrementalCompilationTrait.php
+++ b/src/Build/IncrementalCompilationTrait.php
@@ -365,7 +365,6 @@ trait IncrementalCompilationTrait
             'platform' => $this->targetPlatform,
             'literalStrings' => !$this->noLiteralStrings,
             'debug' => $this->debug,
-            'anonymousOpcode' => $this->canEmbedAnonymousClassOpcode(),
         ]));
 
         // New self-hosted compiler builds embed their immutable source snapshot.