diff --git a/programs/squads-mpl/src/lib.rs b/programs/squads-mpl/src/lib.rs
index f75e699..8152f87 100644
--- a/programs/squads-mpl/src/lib.rs
+++ b/programs/squads-mpl/src/lib.rs
@@ -353,7 +353,10 @@ pub mod squads_mpl {
             match ctx.accounts.transaction.authority_index {
                 // if its a 0 authority, use the MS pda seeds
                 0 => {
-                   invoke_signed(
+                    if &ix.program_id != ctx.program_id {
+                        return err!(MsError::InvalidAuthorityIndex);
+                    } 
+                    invoke_signed(
                         &ix,
                         &ix_account_infos,
                         &[&ms_authority_seeds]
@@ -430,6 +433,10 @@ pub mod squads_mpl {
             ix_account_infos.push(ix_account_info.clone());
         }
 
+        if tx.authority_index < 1 && &ix.program_id != ctx.program_id {
+            return err!(MsError::InvalidAuthorityIndex);
+        } 
+
         invoke_signed(
             &ix,
             &ix_account_infos,