diff -r dde8ea5d7ffd -r e24132839317 debian/control
--- a/debian/control	Fri Jan 17 16:09:39 2014 +0100
+++ b/debian/control	Tue Jan 21 13:12:36 2014 +0100
@@ -43,7 +43,9 @@
 
 Package: cubicweb-server
 Architecture: all
-Conflicts: cubicweb-multisources
+Conflicts:
+ cubicweb-multisources
+ yams (>= 0.39)
 Replaces: cubicweb-multisources
 Provides: cubicweb-multisources
 Depends: