diff --git a/Shorewall6/lib.base b/Shorewall6/lib.base
index e2a8da809..c25bea42c 100644
--- a/Shorewall6/lib.base
+++ b/Shorewall6/lib.base
@@ -735,6 +735,7 @@ determine_capabilities() {
     CONNLIMIT_MATCH=
     TIME_MATCH=
     GOTO_TARGET=
+    IPMARK_TARGET=
 
     chain=fooX$$
 
@@ -828,6 +829,7 @@ determine_capabilities() {
 	fi
 
 	qt $IP6TABLES -t mangle -A $chain -j CLASSIFY --set-class 1:1 && CLASSIFY_TARGET=Yes
+	qt $IP6TABLES -t mangle -A $chain -j IPMARK --addr src && IPMARK_TARGET=Yes
 	qt $IP6TABLES -t mangle -F $chain
 	qt $IP6TABLES -t mangle -X $chain
 	qt $IP6TABLES -t mangle -L FORWARD -n && MANGLE_FORWARD=Yes
@@ -919,6 +921,7 @@ report_capabilities() {
 	report_capability "Connlimit Match" $CONNLIMIT_MATCH
 	report_capability "Time Match" $TIME_MATCH
 	report_capability "Goto Support" $GOTO_TARGET
+	report_capability "IPMARK Target" $IPMARK_TARGET
     fi
 
     [ -n "$PKTTYPE" ] || USEPKTTYPE=
@@ -972,6 +975,7 @@ report_capabilities1() {
     report_capability1 CONNLIMIT_MATCH
     report_capability1 TIME_MATCH
     report_capability1 GOTO_TARGET
+    report_capability1 IPMARK_TARGET
     
     echo CAPVERSION=$SHOREWALL_CAPVERSION
 }