diff --git a/pisi/operations/build.py b/pisi/operations/build.py
index 9d3f19cc..167fd71b 100644
--- a/pisi/operations/build.py
+++ b/pisi/operations/build.py
@@ -13,6 +13,7 @@
 
 # python standard library
 import os
+import re
 import sys
 import glob
 import copy