diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 2763176e369c..9cd8122a5c38 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1466,9 +1466,9 @@ static int fl_ht_insert_unique(struct cls_fl_filter *fnew,
 	struct fl_flow_mask *mask = fnew->mask;
 	int err;
 
-	err = rhashtable_insert_fast(&mask->ht,
-				     &fnew->ht_node,
-				     mask->filter_ht_params);
+	err = rhashtable_lookup_insert_fast(&mask->ht,
+					    &fnew->ht_node,
+					    mask->filter_ht_params);
 	if (err) {
 		*in_ht = false;
 		/* It is okay if filter with same key exists when
diff --git a/tools/testing/selftests/tc-testing/tc-tests/filters/tests.json b/tools/testing/selftests/tc-testing/tc-tests/filters/tests.json
index 2d096b2abf2c..e2f92cefb8d5 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/filters/tests.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/filters/tests.json
@@ -58,5 +58,25 @@
             "$TC qdisc del dev $DEV2 ingress",
             "/bin/rm $BATCH_FILE"
         ]
+    },
+    {
+        "id": "4cbd",
+        "name": "Try to add filter with duplicate key",
+        "category": [
+            "filter",
+            "flower"
+        ],
+        "setup": [
+            "$TC qdisc add dev $DEV2 ingress",
+            "$TC filter add dev $DEV2 protocol ip prio 1 parent ffff: flower dst_mac e4:11:22:11:4a:51 src_mac e4:11:22:11:4a:50 ip_proto tcp src_ip 1.1.1.1 dst_ip 2.2.2.2 action drop"
+        ],
+        "cmdUnderTest": "$TC filter add dev $DEV2 protocol ip prio 1 parent ffff: flower dst_mac e4:11:22:11:4a:51 src_mac e4:11:22:11:4a:50 ip_proto tcp src_ip 1.1.1.1 dst_ip 2.2.2.2 action drop",
+        "expExitCode": "2",
+        "verifyCmd": "$TC -s filter show dev $DEV2 ingress",
+        "matchPattern": "filter protocol ip pref 1 flower chain 0 handle",
+        "matchCount": "1",
+        "teardown": [
+            "$TC qdisc del dev $DEV2 ingress"
+        ]
     }
 ]