diff --git a/install/calculate b/install/calculate
index 7e6be9c..e507caa 100755
--- a/install/calculate
+++ b/install/calculate
@@ -6636,7 +6636,9 @@ sub initrd_clean{
 		   $1 ne 'aufs' &&
 		   $1 ne 'exportfs' &&
 
-		   $1 ne 'unionfs'
+		   $1 ne 'unionfs' &&
+
+		   $1 ne 'dm_mod'
 		){
 			`rm $_`;
 		}