diff --git a/tests/tzdata-checker/runtest.sh b/tests/tzdata-checker/runtest.sh
index eedc833..af24c09 100755
--- a/tests/tzdata-checker/runtest.sh
+++ b/tests/tzdata-checker/runtest.sh
@@ -73,12 +73,13 @@ rlJournalStart
 
   rlPhaseStartSetup "Test zdump"
     for zone in `cat zones.int`; do
-      rlRun "./zdump -v -c 1970,$hiyear $zone >ref"
-      if uname -r | egrep -o -q '\.el5'; then  # glibc's zdump is out of sync for RHEL5
+      if rlIsRHEL "<8"; then # glibc's zdump is out of sync for '-v option'
+        rlRun "./zdump -v -c 1970,$hiyear $zone >ref"
         rlRun "./zdump -v -c 1970,$hiyear /usr/share/zoneinfo/$zone >cur"
         sed -i 's|^/usr/share/zoneinfo/||' cur
       else
-        rlRun "zdump -v -c 1970,$hiyear $zone >cur"
+        rlRun "./zdump -V -c 1970,$hiyear $zone >ref"
+        rlRun "zdump -V -c 1970,$hiyear $zone >cur"
       fi
 
       # normalize zdump outputs