diff --git a/tools/marvin/marvin/integration/lib/base.py b/tools/marvin/marvin/integration/lib/base.py
index 8d9a25d562d..d927c2afac3 100755
--- a/tools/marvin/marvin/integration/lib/base.py
+++ b/tools/marvin/marvin/integration/lib/base.py
@@ -376,7 +376,7 @@ class VirtualMachine:
             cmd.hostid = hostid
 
         if "userdata" in services:
-            cmd.userdata = base64.b64encode(services["userdata"])
+            cmd.userdata = base64.urlsafe_b64encode(services["userdata"])
 
         if group:
             cmd.group = group