diff --git a/src/libnm-platform/nm-platform.c b/src/libnm-platform/nm-platform.c
index 987b8f2dd..cceabb7f9 100644
--- a/src/libnm-platform/nm-platform.c
+++ b/src/libnm-platform/nm-platform.c
@@ -7761,14 +7761,12 @@ nm_platform_mptcp_addr_to_string(const NMPlatformMptcpAddr *mptcp_addr, char *bu
 
     g_snprintf(buf,
                len,
-               "%s" /* in_kernel */
                "%s" /* address */
                "%s" /* port */
                "%s" /* id */
                "%s" /* flags */
                "%s" /* ifindex */
                "",
-               mptcp_addr->in_kernel ? "" : "[nm] ",
                str_addr,
                mptcp_addr->port == 0 ? "" : nm_sprintf_buf(str_port, " port %u", mptcp_addr->port),
                mptcp_addr->id == 0 ? "" : nm_sprintf_buf(str_id, " id %u", mptcp_addr->id),
@@ -7785,13 +7783,7 @@ nm_platform_mptcp_addr_hash_update(const NMPlatformMptcpAddr *obj, NMHashState *
     nm_assert(obj);
     nm_assert_addr_family_or_unspec(obj->addr_family);
 
-    nm_hash_update_vals(h,
-                        obj->id,
-                        obj->flags,
-                        obj->port,
-                        obj->addr_family,
-                        (bool) obj->in_kernel,
-                        obj->ifindex);
+    nm_hash_update_vals(h, obj->id, obj->flags, obj->port, obj->addr_family, obj->ifindex);
     if (NM_IN_SET(obj->addr_family, AF_INET, AF_INET6))
         nm_hash_update(h, &obj->addr, nm_utils_addr_family_to_size(obj->addr_family));
 }
@@ -7806,7 +7798,6 @@ nm_platform_mptcp_addr_cmp(const NMPlatformMptcpAddr *a, const NMPlatformMptcpAd
 
     NM_CMP_FIELD(a, b, ifindex);
     NM_CMP_FIELD(a, b, id);
-    NM_CMP_FIELD_UNSAFE(a, b, in_kernel);
     NM_CMP_FIELD(a, b, addr_family);
     if (NM_IN_SET(a->addr_family, AF_INET, AF_INET6))
         NM_CMP_FIELD_MEMCMP_LEN(a, b, addr, nm_utils_addr_family_to_size(a->addr_family));
diff --git a/src/libnm-platform/nm-platform.h b/src/libnm-platform/nm-platform.h
index 2f41b0c8b..367f4316d 100644
--- a/src/libnm-platform/nm-platform.h
+++ b/src/libnm-platform/nm-platform.h
@@ -1098,21 +1098,11 @@ typedef void (*NMPlatformAsyncCallback)(GError *error, gpointer user_data);
 
 typedef struct {
     __NMPlatformObjWithIfindex_COMMON;
-
     guint32  id;
     guint32  flags;
     guint16  port;
     NMIPAddr addr;
     gint8    addr_family;
-
-    /* If TRUE, then the instance was received by kernel and is inside NMPlatform
-     * cache. In that case, the "id" is set and acts as primary key for the instance.
-     *
-     * If FALSE, this instance is not yet configured in kernel. In this case,
-     * the tuple (id, addr_family, addr) is the primary key of the instance.
-     * This way, we can track mptcp addresses in NetworkManager internally,
-     * before configuring them in kernel. */
-    bool in_kernel : 1;
 } NMPlatformMptcpAddr;
 
 #undef __NMPlatformObjWithIfindex_COMMON