diff --git a/.gitignore b/.gitignore
index c0af248..5bf4bf9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@
 /thin-provisioning-tools-0.5.6.tar.gz
 /thin-provisioning-tools-0.6.0.tar.gz
 /thin-provisioning-tools-0.6.2-rc3.tar.gz
+/thin-provisioning-tools-0.6.2-rc4.tar.gz
diff --git a/device-mapper-persistent-data.spec b/device-mapper-persistent-data.spec
index e33f6a4..a6cdf55 100644
--- a/device-mapper-persistent-data.spec
+++ b/device-mapper-persistent-data.spec
@@ -2,8 +2,8 @@
 # Copyright (C) 2011-2016 Red Hat, Inc
 #
 
-%define pre_release_upstream -rc3
-%define pre_release rc3
+%define pre_release_upstream -rc4
+%define pre_release rc4
 
 Summary: Device-mapper Persistent Data Tools
 Name: device-mapper-persistent-data
@@ -85,6 +85,9 @@ make DESTDIR=%{buildroot} MANDIR=%{_mandir} install
 %{_sbindir}/thin_trim
 
 %changelog
+* Mon Feb 15 2016 Peter Rajnoha <prajnoha@redhat.com> - 0.6.2-0.1.rc4
+- Fix bug in mapping comparison while using thin_delta.
+
 * Mon Feb 15 2016 Peter Rajnoha <prajnoha@redhat.com> - 0.6.2-0.1.rc3
 - Fix recent regression in thin_repair.
 - Force g++-98 dialect.
diff --git a/sources b/sources
index f3d4bb5..337ce81 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-6652d2774db40decd5dcfaa26ea9ec7c  thin-provisioning-tools-0.6.2-rc3.tar.gz
+95209856957fcb1299f8bbf1c473ba50  thin-provisioning-tools-0.6.2-rc4.tar.gz