diff --git a/crates/ironrdp-pdu/src/gcc/core_data/client.rs b/crates/ironrdp-pdu/src/gcc/core_data/client.rs
index 231b794d7..5dffd6af4 100644
--- a/crates/ironrdp-pdu/src/gcc/core_data/client.rs
+++ b/crates/ironrdp-pdu/src/gcc/core_data/client.rs
@@ -475,5 +475,7 @@ bitflags! {
         const SUPPORT_DYNAMIC_TIME_ZONE = 0x0200;
         const SUPPORT_HEART_BEAT_PDU = 0x0400;
         const SUPPORT_SKIP_CHANNELJOIN = 0x0800;
+        // The source may set any bits
+        const _ = !0;
     }
 }
diff --git a/crates/ironrdp-pdu/src/gcc/core_data/server.rs b/crates/ironrdp-pdu/src/gcc/core_data/server.rs
index c57adb5aa..c7cec8d1f 100644
--- a/crates/ironrdp-pdu/src/gcc/core_data/server.rs
+++ b/crates/ironrdp-pdu/src/gcc/core_data/server.rs
@@ -94,5 +94,7 @@ bitflags! {
         const DYNAMIC_DST_SUPPORTED = 0x0000_0002;
         const EDGE_ACTIONS_SUPPORTED_V2 = 0x0000_0004;
         const SKIP_CHANNELJOIN_SUPPORTED = 0x0000_0008;
+        // The source may set any bits
+        const _ = !0;
     }
 }