diff --git a/packaging/centos63/cloud.spec b/packaging/centos63/cloud.spec
index e1a29030ca8..04bc8051508 100644
--- a/packaging/centos63/cloud.spec
+++ b/packaging/centos63/cloud.spec
@@ -63,6 +63,7 @@ intelligent IaaS cloud implementation.
 Summary:   CloudStack management server UI
 Requires: %{_tomcatversion}
 Requires: %{_javaversion}
+Conflicts: java-1.8.0-openjdk
 Requires: python
 Requires: bash
 Requires: bzip2
@@ -117,6 +118,7 @@ The Apache CloudStack files shared between agent and management server
 Summary: CloudStack Agent for KVM hypervisors
 Requires: openssh-clients
 Requires: %{_javaversion}
+Conflicts: java-1.8.0-openjdk
 Requires: %{name}-common = %{_ver}
 Requires: libvirt
 Requires: bridge-utils
@@ -156,6 +158,7 @@ The CloudStack baremetal agent
 %package usage
 Summary: CloudStack Usage calculation server
 Requires: %{_javaversion}
+Conflicts: java-1.8.0-openjdk
 Requires: jsvc
 Requires: jakarta-commons-daemon
 Requires: jakarta-commons-daemon-jsvc