diff --git a/libguestfs.changes b/libguestfs.changes
index 2dc5855..f0f37ee 100644
--- a/libguestfs.changes
+++ b/libguestfs.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Dec 11 17:54:19 CET 2012 - ohering@suse.de
+
+- add Conflicts: (libguestfs0|guestfs-data) with old versions to
+  guestfs-tools to make sure all parts match the same API
+
 -------------------------------------------------------------------
 Thu Nov 29 20:25:33 CET 2012 - ohering@suse.de
 
diff --git a/libguestfs.spec b/libguestfs.spec
index 6b31182..c95f82e 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -154,6 +154,8 @@ Requires:       perl(Win::Hivex::Regedit)
 %endif
 %{perl_requires}
 Recommends:     guestfs-data
+Conflicts:      guestfs-data < %{version}
+Conflicts:      libguestfs0 < %{version}
 
 %description -n guestfs-tools
 libguestfs is a set of tools for accessing and modifying virtual machine (VM)