diff --git a/snitch.el b/snitch.el
line changes: +1/-0
index e2c7fbb..06c1c7f
--- a/snitch.el
+++ b/snitch.el

@@ -306,6 +306,7 @@
 
 (require 'eieio) ; class objects
 (require 'cl-macs) ; cl loops
+(require 'package) ; backtrace package sources
 
 (require 'snitch-backtrace)
 (require 'snitch-custom)