diff --git a/programs/multisig/src/lib.rs b/programs/multisig/src/lib.rs
index 2abba30..768d504 100644
--- a/programs/multisig/src/lib.rs
+++ b/programs/multisig/src/lib.rs
@@ -267,7 +267,7 @@ impl From<&Transaction> for Instruction {
     fn from(tx: &Transaction) -> Instruction {
         Instruction {
             program_id: tx.program_id,
-            accounts: tx.accounts.iter().map(AccountMeta::from).collect(),
+            accounts: tx.accounts.iter().map(Into::into).collect(),
             data: tx.data.clone(),
         }
     }
@@ -300,10 +300,12 @@ impl From<&AccountMeta> for TransactionAccount {
 }
 
 fn assert_unique_owners(owners: &[Pubkey]) -> Result<()> {
-    let mut uniq_owners = owners.to_vec();
-    uniq_owners.sort();
-    uniq_owners.dedup();
-    require!(owners.len() == uniq_owners.len(), UniqueOwners);
+    for (i, owner) in owners.iter().enumerate() {
+        require!(
+            !owners.iter().skip(i + 1).any(|item| item == owner),
+            UniqueOwners
+        )
+    }
     Ok(())
 }
 
diff --git a/tests/multisig.js b/tests/multisig.js
index da068a0..af84186 100644
--- a/tests/multisig.js
+++ b/tests/multisig.js
@@ -132,4 +132,39 @@ describe("multisig", () => {
     assert.deepStrictEqual(multisigAccount.owners, newOwners);
     assert.ok(multisigAccount.ownerSetSeqno === 1);
   });
+
+  it("Assert Unique Owners", async () => {
+    const multisig = anchor.web3.Keypair.generate();
+    const [_multisigSigner, nonce] =
+      await anchor.web3.PublicKey.findProgramAddress(
+        [multisig.publicKey.toBuffer()],
+        program.programId
+      );
+    const multisigSize = 200; // Big enough.
+
+    const ownerA = anchor.web3.Keypair.generate();
+    const ownerB = anchor.web3.Keypair.generate();
+    const owners = [ownerA.publicKey, ownerB.publicKey, ownerA.publicKey];
+
+    const threshold = new anchor.BN(2);
+    try {
+      await program.rpc.createMultisig(owners, threshold, nonce, {
+        accounts: {
+          multisig: multisig.publicKey,
+          rent: anchor.web3.SYSVAR_RENT_PUBKEY,
+        },
+        instructions: [
+          await program.account.multisig.createInstruction(
+            multisig,
+            multisigSize
+          ),
+        ],
+        signers: [multisig],
+      });
+      assert.fail();
+    } catch (err) {
+      assert.equal(err.code, 308);
+      assert.equal(err.msg, "Owners must be unique");
+    }
+  });
 });