diff --git a/pandora_agents/unix/ChangeLog b/pandora_agents/unix/ChangeLog
index d121a7584a..20555e155b 100644
--- a/pandora_agents/unix/ChangeLog
+++ b/pandora_agents/unix/ChangeLog
@@ -1,3 +1,7 @@
+2010-06-04  Ramon Novoa  <rnovoa@artica.es>
+
+	* pandora_agent.spec: Fixed. Upgrading an RPM broke the installation.
+
 2010-05-20  Miguel de Dios  <miguel.dedios@artica.es>
 
 	* DEBIAN/postinst, DEBIAN/make_deb_package.sh: fixed the script to generate
diff --git a/pandora_agents/unix/pandora_agent.spec b/pandora_agents/unix/pandora_agent.spec
index a21b006b52..c7da5b5507 100755
--- a/pandora_agents/unix/pandora_agent.spec
+++ b/pandora_agents/unix/pandora_agent.spec
@@ -88,6 +88,11 @@ chkconfig pandora_agent_daemon on
 
 %preun
 
+# Upgrading
+if [ "$1" = "1" ]; then
+        exit 0
+fi
+
 chkconfig --del pandora_agent_daemon 
 /etc/init.d/pandora_agent_daemon stop
 rm /etc/init.d/pandora_agent_daemon