diff --git a/wo/core/addswap.py b/wo/core/addswap.py
index 92011b4..02df054 100644
--- a/wo/core/addswap.py
+++ b/wo/core/addswap.py
@@ -5,6 +5,7 @@ from wo.core.fileutils import WOFileUtils
 from wo.core.aptget import WOAptGet
 from wo.core.logging import Log
 import os
+import psutil
 
 
 class WOSwap():