diff --git a/bindings/nostr-ffi/src/message/relay.rs b/bindings/nostr-ffi/src/message/relay.rs
index 73e5320a7..59d0924c7 100644
--- a/bindings/nostr-ffi/src/message/relay.rs
+++ b/bindings/nostr-ffi/src/message/relay.rs
@@ -26,6 +26,14 @@ pub enum RelayMessage {
         subscription_id: String,
         count: u64,
     },
+    NegMsg {
+        subscription_id: String,
+        message: String,
+    },
+    NegErr {
+        subscription_id: String,
+        code: String,
+    },
 }
 
 impl From<NRelayMessage> for RelayMessage {
@@ -59,6 +67,20 @@ impl From<NRelayMessage> for RelayMessage {
                 subscription_id: subscription_id.to_string(),
                 count: count as u64,
             },
+            NRelayMessage::NegMsg {
+                subscription_id,
+                message,
+            } => Self::NegMsg {
+                subscription_id: subscription_id.to_string(),
+                message,
+            },
+            NRelayMessage::NegErr {
+                subscription_id,
+                code,
+            } => Self::NegErr {
+                subscription_id: subscription_id.to_string(),
+                code: code.to_string(),
+            },
         }
     }
 }
diff --git a/bindings/nostr-ffi/src/nostr.udl b/bindings/nostr-ffi/src/nostr.udl
index 9f1a33562..b949b8b96 100644
--- a/bindings/nostr-ffi/src/nostr.udl
+++ b/bindings/nostr-ffi/src/nostr.udl
@@ -136,6 +136,8 @@ interface RelayMessage {
   Ok(string event_id, boolean status, string message);
   Auth(string challenge);
   Count(string subscription_id, u64 count);
+  NegMsg(string subscription_id, string message);
+  NegErr(string subscription_id, string code);
 };
 
 interface ZapRequestData {
diff --git a/bindings/nostr-sdk-ffi/src/nostr_sdk.udl b/bindings/nostr-sdk-ffi/src/nostr_sdk.udl
index 507ec9dd3..3fdf391ca 100644
--- a/bindings/nostr-sdk-ffi/src/nostr_sdk.udl
+++ b/bindings/nostr-sdk-ffi/src/nostr_sdk.udl
@@ -156,6 +156,8 @@ interface RelayMessage {
   Ok(string event_id, boolean status, string message);
   Auth(string challenge);
   Count(string subscription_id, u64 count);
+  NegMsg(string subscription_id, string message);
+  NegErr(string subscription_id, string code);
 };
 
 interface ZapRequestData {