diff --git a/sha1collisiondetection.changes b/sha1collisiondetection.changes
index ef8d0e5..fdca582 100644
--- a/sha1collisiondetection.changes
+++ b/sha1collisiondetection.changes
@@ -1,10 +1,11 @@
 -------------------------------------------------------------------
-Mon Apr 10 08:27:43 UTC 2017 - astieger@suse.com
+Mon Apr 10 13:29:43 UTC 2017 - astieger@suse.com
 
 - update to 1.0.3:
   * SIMD code removed
   * performance improvements
 - package library
+- conflicts with libmd-devel
 
 -------------------------------------------------------------------
 Tue Feb 28 20:59:56 UTC 2017 - astieger@suse.com
diff --git a/sha1collisiondetection.spec b/sha1collisiondetection.spec
index f8ab35d..6e079e5 100644
--- a/sha1collisiondetection.spec
+++ b/sha1collisiondetection.spec
@@ -48,6 +48,8 @@ It is very fast and takes less than twice the amount of time as regular SHA-1.
 Summary:        Development files for
 Group:          Development/Libraries/C and C++
 Requires:       libsha1detectcoll1 = %{version}
+# both libs offer /usr/include/sha1.h
+Conflicts:      libmd-devel
 
 %description -n libsha1detectcoll-devel
 This library was designed as near drop-in replacements for other sha1sum