diff --git a/src/platform/nm-linux-platform.c b/src/platform/nm-linux-platform.c
index 6fe1d466d2..0cf743b453 100644
--- a/src/platform/nm-linux-platform.c
+++ b/src/platform/nm-linux-platform.c
@@ -3845,6 +3845,8 @@ ip6_route_add (NMPlatform *platform, int ifindex, NMIPConfigSource source,
                struct in6_addr network, int plen, struct in6_addr gateway,
                guint32 metric, guint32 mss)
 {
+	metric = nm_utils_ip6_route_metric_normalize (metric);
+
 	return add_object (platform, build_rtnl_route (AF_INET6, ifindex, source, &network, plen, &gateway, NULL, metric, mss));
 }
 
@@ -3962,6 +3964,8 @@ ip6_route_delete (NMPlatform *platform, int ifindex, struct in6_addr network, in
 {
 	struct in6_addr gateway = IN6ADDR_ANY_INIT;
 
+	metric = nm_utils_ip6_route_metric_normalize (metric);
+
 	return delete_object (platform, build_rtnl_route (AF_INET6, ifindex, NM_IP_CONFIG_SOURCE_UNKNOWN ,&network, plen, &gateway, NULL, metric, 0), FALSE) &&
 	    refresh_route (platform, AF_INET6, ifindex, &network, plen, metric);
 }
@@ -3989,6 +3993,8 @@ ip4_route_exists (NMPlatform *platform, int ifindex, in_addr_t network, int plen
 static gboolean
 ip6_route_exists (NMPlatform *platform, int ifindex, struct in6_addr network, int plen, guint32 metric)
 {
+	metric = nm_utils_ip6_route_metric_normalize (metric);
+
 	return ip_route_exists (platform, AF_INET6, ifindex, &network, plen, metric);
 }
 
diff --git a/src/platform/tests/test-route.c b/src/platform/tests/test-route.c
index 2c70b412bb..9ccca0a0f6 100644
--- a/src/platform/tests/test-route.c
+++ b/src/platform/tests/test-route.c
@@ -2,6 +2,7 @@
 
 #include "test-common.h"
 #include "nm-test-utils.h"
+#include "NetworkManagerUtils.h"
 
 #define DEVICE_NAME "nm-test-device"
 
@@ -205,21 +206,21 @@ test_ip6_route (void)
 	rts[0].plen = 128;
 	rts[0].ifindex = ifindex;
 	rts[0].gateway = in6addr_any;
-	rts[0].metric = metric;
+	rts[0].metric = nm_utils_ip6_route_metric_normalize (metric);
 	rts[0].mss = mss;
 	rts[1].source = NM_IP_CONFIG_SOURCE_USER;
 	rts[1].network = network;
 	rts[1].plen = plen;
 	rts[1].ifindex = ifindex;
 	rts[1].gateway = gateway;
-	rts[1].metric = metric;
+	rts[1].metric = nm_utils_ip6_route_metric_normalize (metric);
 	rts[1].mss = mss;
 	rts[2].source = NM_IP_CONFIG_SOURCE_USER;
 	rts[2].network = in6addr_any;
 	rts[2].plen = 0;
 	rts[2].ifindex = ifindex;
 	rts[2].gateway = gateway;
-	rts[2].metric = metric;
+	rts[2].metric = nm_utils_ip6_route_metric_normalize (metric);
 	rts[2].mss = mss;
 	g_assert_cmpint (routes->len, ==, 3);
 	g_assert (!memcmp (routes->data, rts, sizeof (rts)));