diff --git a/debian/koha-common.postinst b/debian/koha-common.postinst
index f5ee256f16..9156a952f3 100644
--- a/debian/koha-common.postinst
+++ b/debian/koha-common.postinst
@@ -182,7 +182,7 @@ log4perl.appender.SIP=Log::Log4perl::Appender::File
 log4perl.appender.SIP.filename=/var/log/koha/$site/sip.log
 log4perl.appender.SIP.mode=append
 log4perl.appender.SIP.layout=PatternLayout
-log4perl.appender.SIP.layout.ConversionPattern=[%d] [%p] %m %l %n
+log4perl.appender.SIP.layout.ConversionPattern=[%d] [%P] [%p] %m %l %n
 log4perl.appender.SIP.utf8=1
 
 EOF
diff --git a/debian/koha-core.postinst b/debian/koha-core.postinst
index 379b9e89cc..348367e11d 100644
--- a/debian/koha-core.postinst
+++ b/debian/koha-core.postinst
@@ -182,7 +182,7 @@ log4perl.appender.SIP=Log::Log4perl::Appender::File
 log4perl.appender.SIP.filename=/var/log/koha/$site/sip.log
 log4perl.appender.SIP.mode=append
 log4perl.appender.SIP.layout=PatternLayout
-log4perl.appender.SIP.layout.ConversionPattern=[%d] [%p] %m %l %n
+log4perl.appender.SIP.layout.ConversionPattern=[%d] [%P] [%p] %m %l %n
 log4perl.appender.SIP.utf8=1
 
 EOF
diff --git a/debian/templates/log4perl-site.conf.in b/debian/templates/log4perl-site.conf.in
index 16446c2ffd..4db8f89be8 100644
--- a/debian/templates/log4perl-site.conf.in
+++ b/debian/templates/log4perl-site.conf.in
@@ -35,7 +35,7 @@ log4perl.appender.SIP=Log::Log4perl::Appender::File
 log4perl.appender.SIP.filename=__LOG_DIR__/sip.log
 log4perl.appender.SIP.mode=append
 log4perl.appender.SIP.layout=PatternLayout
-log4perl.appender.SIP.layout.ConversionPattern=[%d] [%p] %m %l %n
+log4perl.appender.SIP.layout.ConversionPattern=[%d] [%P] [%p] %m %l %n
 log4perl.appender.SIP.utf8=1
 
 
diff --git a/etc/log4perl.conf b/etc/log4perl.conf
index 16446c2ffd..940c2d0397 100644
--- a/etc/log4perl.conf
+++ b/etc/log4perl.conf
@@ -35,10 +35,9 @@ log4perl.appender.SIP=Log::Log4perl::Appender::File
 log4perl.appender.SIP.filename=__LOG_DIR__/sip.log
 log4perl.appender.SIP.mode=append
 log4perl.appender.SIP.layout=PatternLayout
-log4perl.appender.SIP.layout.ConversionPattern=[%d] [%p] %m %l %n
+log4perl.appender.SIP.layout.ConversionPattern=[%d] [%P] [%p] %m %l %n
 log4perl.appender.SIP.utf8=1
 
-
 log4perl.logger.plack-opac = WARN, PLACKOPAC
 log4perl.appender.PLACKOPAC=Log::Log4perl::Appender::File
 log4perl.appender.PLACKOPAC.filename=__LOG_DIR__/plack-opac-error.log