diff --git a/src/ssn/patcher-installer/launch.ts b/src/ssn/patcher-installer/launch.ts
index acad2bb..a6db94e 100644
--- a/src/ssn/patcher-installer/launch.ts
+++ b/src/ssn/patcher-installer/launch.ts
@@ -12,7 +12,7 @@ export default function launchProcess(diskFile: string, offset: number, compress
       '--size', compressedSize,
     ];
     if (decryptionKeys !== undefined) {
-      parameters.push('--keys', ...decryptionKeys);
+      parameters.push('--keys', decryptionKeys.join(','));
     }
     const spawnedProcess = childProcess.spawn(processPath, parameters.map((value) => value.toString(), { cwd: '.' }));