diff --git a/programs/mmm/src/errors.rs b/programs/mmm/src/errors.rs
index e5a8fc8..2f18e73 100644
--- a/programs/mmm/src/errors.rs
+++ b/programs/mmm/src/errors.rs
@@ -67,5 +67,7 @@ pub enum MMMErrorCode {
     #[msg("Invalid token member extensions")]
     InvalidTokenMemberExtension, // 0x178f
     #[msg("Invalid asset collection")]
-    InvalidAssetCollection,
+    InvalidAssetCollection, // 0x1790
+    #[msg("Invalid token extension")]
+    InvalidTokenExtension, // 0x1791
 }
diff --git a/programs/mmm/src/util.rs b/programs/mmm/src/util.rs
index 1d9985f..1e50b39 100644
--- a/programs/mmm/src/util.rs
+++ b/programs/mmm/src/util.rs
@@ -716,7 +716,7 @@ pub fn assert_valid_extension(mint_deserialized: &StateWithExtensions<Token22Min
     let extension_types = mint_deserialized.get_extension_types()?;
     for ext in extension_types.iter() {
         if !T22_EXTENSION_ALLOW_LIST.contains(ext) {
-            return Err(MMMErrorCode::InvalidTokenMint.into());
+            return Err(MMMErrorCode::InvalidTokenExtension.into());
         }
     }