diff --git a/check_packages2install b/check_packages2install
index 0ac30cdf79f1151c1cd428b07da407a830031578..0fafcbdcec1b2f538cb1337f356f47da877fd98c 100755
--- a/check_packages2install
+++ b/check_packages2install
@@ -16,6 +16,7 @@
 # 2020-03-05  v1.3  <axel.hahn@iml.unibe.ch> switch to ph.* helper functions
 # 2020-03-11  v1.4  <axel.hahn@iml.unibe.ch> add -c -w limits; added perfdata (yum)
 # 2021-05-11  v1.4  <axel.hahn@iml.unibe.ch> added centos8 support
+# 2021-08-20  v1.5  <martin.gasser@iml.unibe.ch> bug fixing - missing sudo in yum command
 # ======================================================================
 
 
@@ -79,7 +80,7 @@ function checkYum(){
 
   # summary=`ph.execIfReady "/usr/bin/yum --security  check-update 2>&1 | fgrep 'security'" `
   # summary=`ph.execIfReady "/usr/bin/yum --security  check-update 2>&1 | fgrep 'security'" `
-  ph.execIfReady "/usr/bin/yum --security  check-update > $_yumout 2>&1"
+  ph.execIfReady "sudo /usr/bin/yum --security  check-update > $_yumout 2>&1"
   local summary=$( cat $_yumout | grep security )
   test -z "$summary" && summary='no data .. no packages to install'