diff --git a/Jenkinsfile b/Jenkinsfile
index 8c166ad..d93898a 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -50,12 +50,16 @@ spec:
             defaultValue: 'rockyman',
             description: 'B2 bucket name for uploads'
         )
-        number(
+        string(
             name: 'PARALLEL_DOWNLOADS',
-            defaultValue: 5,
+            defaultValue: '5',
             description: 'Number of parallel downloads'
         )
-        number(
+        string(
+            name: 'PARALLEL_CONVERSIONS',
+            defaultValue: '10',
+            description: 'Number of parallel conversions'
+        )
             name: 'PARALLEL_CONVERSIONS',
             defaultValue: 10,
             description: 'Number of parallel conversions'