diff --git a/internal/rbd/rbd_util.go b/internal/rbd/rbd_util.go
index 15c66248a..d911574cc 100644
--- a/internal/rbd/rbd_util.go
+++ b/internal/rbd/rbd_util.go
@@ -488,7 +488,7 @@ func (rv *rbdVolume) flattenRbdImage(ctx context.Context, cr *util.Credentials,
 	}
 
 	if forceFlatten || (depth >= hardlimit) || (depth >= softlimit) {
-		args := []string{"flatten", rv.Pool + "/" + rv.RbdImageName, "--id", cr.ID, "--keyfile=" + cr.KeyFile, "-m", rv.Monitors}
+		args := []string{"flatten", rv.String(), "--id", cr.ID, "--keyfile=" + cr.KeyFile, "-m", rv.Monitors}
 		supported, err := addRbdManagerTask(ctx, rv, args)
 		if supported {
 			if err != nil {