diff --git a/tests/test_bls.py b/tests/test_bls.py
index aa24f159..7cec7380 100644
--- a/tests/test_bls.py
+++ b/tests/test_bls.py
@@ -249,27 +249,21 @@ def test_multi_multi():
     pubkeys = [privtopub(k) for k in privkeys]
 
     class Attestation:
-        def __init__(self, msg_1, msg_2):
-            msg_1_validators = sample(validator_indices, 3)
-            msg_2_validators = sample(validator_indices, 3)
+        def __init__(self):
+            msg_1_validators = (1, 2, 3, 4)
+            msg_2_validators = (4, 5, 6, 7)
             self.agg_pubkeys = [
                 aggregate_pubkeys([pubkeys[i] for i in msg_1_validators]),
                 aggregate_pubkeys([pubkeys[i] for i in msg_2_validators]),
             ]
-            self.msgs = [msg_1, msg_2]
-            msg_1_sigs = [sign(msg_1, privkeys[i], domain) for i in msg_1_validators]
-            msg_2_sigs = [sign(msg_2, privkeys[i], domain) for i in msg_2_validators]
+            self.msgs = (b'\x12' * 32, b'\x34' * 32)
+            msg_1_sigs = [sign(self.msgs[0], privkeys[i], domain) for i in msg_1_validators]
+            msg_2_sigs = [sign(self.msgs[1], privkeys[i], domain) for i in msg_2_validators]
             self.sig = aggregate_signatures([
                 aggregate_signatures(msg_1_sigs),
                 aggregate_signatures(msg_2_sigs),
             ])
-
-    msgs = (
-        (b'\x12' * 32, b'\x34' * 32),
-        (b'\x56' * 32, b'\x78' * 32),
-        (b'\x90' * 32, b'\xab' * 32),
-    )
-    atts = [Attestation(msg_1, msg_2) for msg_1, msg_2 in msgs]
+    atts = (Attestation(),) * 3
     assert verify_multiple_multiple(
         signatures=[att.sig for att in atts],
         pubkeys_and_messages=[[att.agg_pubkeys, att.msgs] for att in atts],