diff --git a/virtualbox-guest-preamble b/virtualbox-guest-preamble
index 34d78f9..42724b2 100644
--- a/virtualbox-guest-preamble
+++ b/virtualbox-guest-preamble
@@ -1,5 +1,8 @@
 Requires: kernel-%1
 Provides: virtualbox-guest-kmp = %version
 #rename from ose version:
-Provides:  virtualbox-ose-guest-kmp-%1 = %version
+Provides: virtualbox-ose-guest-kmp-%1 = %version
 Obsoletes: virtualbox-ose-guest-kmp-%1 < %version
+#host (vboxdrv) and guest (vboxguest) kmp exports the same symbol (RTMemFreeEx)
+#which break loading modules using modprobe (bnc#661740)
+Conflicts: virtualbox-ose-host-kmp
diff --git a/virtualbox-host-preamble b/virtualbox-host-preamble
index 7dea019..1420a5e 100644
--- a/virtualbox-host-preamble
+++ b/virtualbox-host-preamble
@@ -3,3 +3,6 @@ Provides: virtualbox-host-kmp = %version
 #rename from ose version:
 Provides: virtualbox-ose-host-kmp-%1 = %version
 Obsoletes: virtualbox-ose-host-kmp-%1 < %version
+#host (vboxdrv) and guest (vboxguest) kmp exports the same symbol (RTMemFreeEx)
+#which break loading modules using modprobe (bnc#661740)
+Conflicts: virtualbox-ose-guest-kmp
diff --git a/virtualbox.changes b/virtualbox.changes
index 1497672..bec18e5 100644
--- a/virtualbox.changes
+++ b/virtualbox.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Mar 25 07:42:21 UTC 2011 - mseben@gmail.com
+
+- added Confilcts: virtualbox-ose-*-kmp : reason host (vboxdrv) and 
+  guest (vboxguest) kmp exports the same symbol (RTMemFreeEx)
+  which break loading modules using modprobe (bnc#661740)
+
 -------------------------------------------------------------------
 Thu Mar 17 13:17:54 UTC 2011 - mseben@gmail.com