diff --git a/lxd/device/disk.go b/lxd/device/disk.go
index <HASH>..<HASH> 100644
--- a/lxd/device/disk.go
+++ b/lxd/device/disk.go
@@ -69,7 +69,7 @@ type diskSourceNotFoundError struct {
 }
 
 func (e diskSourceNotFoundError) Error() string {
-	return e.msg
+	return fmt.Sprintf("%s: %v", e.msg, e.err)
 }
 
 func (e diskSourceNotFoundError) Unwrap() error {
lxd/device/disk: Included wrapped error in diskSourceNotFoundError