diff --git a/common/foundry_install.py b/common/foundry_install.py
index 22d754d..ea50eeb 100755
--- a/common/foundry_install.py
+++ b/common/foundry_install.py
@@ -1049,6 +1049,7 @@
     # then migrate them to magic (.mag files in layout/ or abstract/).
 
     ignorelist = []
+    tclscript = None
     do_cdl_scaleu  = False
     no_cdl_convert = False
     no_gds_convert = False