diff --git a/builder/osc/common/step_run_source_vm.go b/builder/osc/common/step_run_source_vm.go
index abcda0316..16d10d779 100644
--- a/builder/osc/common/step_run_source_vm.go
+++ b/builder/osc/common/step_run_source_vm.go
@@ -19,7 +19,7 @@ import (
 )
 
 const (
-	RunSourceVmBSUExpectedRootDevice = "ebs"
+	RunSourceVmBSUExpectedRootDevice = "bsu"
 )
 
 type StepRunSourceVm struct {