diff --git a/src/main/java/com/dostalgia/UploadResource.java b/src/main/java/com/dostalgia/UploadResource.java
index b91bd34..4079015 100644
--- a/src/main/java/com/dostalgia/UploadResource.java
+++ b/src/main/java/com/dostalgia/UploadResource.java
@@ -454,7 +454,7 @@ public class UploadResource {
         } else {
             // CD-only game — no executable, mount CD and show a DOS prompt
             Files.writeString(jsdos.resolve("dosbox.conf"), buildCdOnlyDosboxConf(cdImages));
-            Files.writeString(jsdos.resolve("jsdos.json"), buildCdOnlyJsdosJson());
+            Files.write(jsdos.resolve("jsdos.json"), buildCdOnlyJsdosJson());
         }
 
         // ZIP it up directly from extractDir (no temp copy)