diff --git a/bin/tests/system/digdelv/tests.sh b/bin/tests/system/digdelv/tests.sh
index e1ae46bf0c..84b044efde 100644
--- a/bin/tests/system/digdelv/tests.sh
+++ b/bin/tests/system/digdelv/tests.sh
@@ -733,6 +733,18 @@ if [ -x "$DIG" ]; then
   if [ $ret -ne 0 ]; then echo_i "failed"; fi
   status=$((status + ret))
 
+  if [ $HAS_PYYAML -ne 0 ]; then
+    n=$((n + 1))
+    echo_i "check that dig processes +ednsopt=client-tag:value +yaml ($n)"
+    ret=0
+    dig_with_opts @10.53.0.3 +yaml +ednsopt=client-tag:0001 a.example +qr >dig.out.test$n 2>&1 || ret=1
+    $PYTHON yamlget.py dig.out.test$n 0 message query_message_data OPT_PSEUDOSECTION EDNS CLIENT-TAG >yamlget.out.test$n 2>&1 || ret=1
+    read -r value <yamlget.out.test$n
+    [ "$value" = "1" ] || ret=1
+    if [ $ret -ne 0 ]; then echo_i "failed"; fi
+    status=$((status + ret))
+  fi
+
   n=$((n + 1))
   echo_i "check that FORMERR is returned for a too short client-tag ($n)"
   ret=0
@@ -760,6 +772,18 @@ if [ -x "$DIG" ]; then
   if [ $ret -ne 0 ]; then echo_i "failed"; fi
   status=$((status + ret))
 
+  if [ $HAS_PYYAML -ne 0 ]; then
+    n=$((n + 1))
+    echo_i "check that dig processes +ednsopt=server-tag:value +yaml ($n)"
+    ret=0
+    dig_with_opts @10.53.0.3 +yaml +ednsopt=server-tag:0001 a.example +qr >dig.out.test$n 2>&1 || ret=1
+    $PYTHON yamlget.py dig.out.test$n 0 message query_message_data OPT_PSEUDOSECTION EDNS SERVER-TAG >yamlget.out.test$n 2>&1 || ret=1
+    read -r value <yamlget.out.test$n
+    [ "$value" = "1" ] || ret=1
+    if [ $ret -ne 0 ]; then echo_i "failed"; fi
+    status=$((status + ret))
+  fi
+
   n=$((n + 1))
   echo_i "check that FORMERR is returned for a too short server-tag ($n)"
   ret=0