diff --git a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/FirewallRule.inc b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/FirewallRule.inc
index 45f6f3a9..bd3c3cd3 100644
--- a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/FirewallRule.inc
+++ b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/FirewallRule.inc
@@ -74,6 +74,7 @@ class FirewallRule extends Model {
             allow_interface_groups: true,
             allow_ipsec_interface: true,
             allow_openvpn_interface: true,
+            allow_custom: ['any'],
             many: true,
             help_text: 'The interface where packets must originate to match this rule.',
         );
diff --git a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsFirewallRuleTestCase.inc b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsFirewallRuleTestCase.inc
index 5135ec1a..e0d7d922 100644
--- a/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsFirewallRuleTestCase.inc
+++ b/pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Tests/APIModelsFirewallRuleTestCase.inc
@@ -993,4 +993,21 @@ class APIModelsFirewallRuleTestCase extends TestCase {
             $this->assert_equals($rule->updated_by->value, "$client->username@$client->ip_address (API)");
         }
     }
+
+    /**
+     * Checks that we can create a floating firewall rule with the 'any' interface
+     */
+    public function test_floating_rule_with_any_interface(): void {
+        # Create a firewall rule to test with
+        $rule = new FirewallRule(
+            type: 'pass',
+            interface: ['any'],
+            ipprotocol: 'inet',
+            protocol: 'tcp',
+            source: 'any',
+            destination: 'any',
+            floating: true,
+        );
+        $rule->validate();
+    }
 }