Index: fact/tools/pyscripts/pyfact/pyfact.py
===================================================================
--- fact/tools/pyscripts/pyfact/pyfact.py	(revision 13814)
+++ fact/tools/pyscripts/pyfact/pyfact.py	(revision 13815)
@@ -415,4 +415,5 @@
         
 # -----------------------------------------------------------------------------
+import ctypes
 
 class SlowData( FactFits ):