src/jdk.jlink/share/classes/jdk/tools/jmod/JmodOutputStream.java

@@ -34,10 +34,11 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
+import jdk.internal.jmod.JmodFile;
 
 import static jdk.internal.jmod.JmodFile.*;
 
 /**
  * Output stream to write to JMOD file

@@ -55,11 +56,11 @@
 
     private final ZipOutputStream zos;
     private JmodOutputStream(OutputStream out) {
         this.zos = new ZipOutputStream(out);
         try {
-            out.write(JMOD_MAGIC_NUMBER);
+            JmodFile.writeMagicNumber(out);
         } catch (IOException e) {
             throw new UncheckedIOException(e);
         }
     }