diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index e55e24a7a..19915ddd8 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -277,5 +277,6 @@ sub system_info
 # this package declaration prevents an ugly fatal warning to be emitted when
 # spawning a new thread
 package GLUquadricObjPtr;
+package Wx::Printout;
 
 1;