diff --git a/ruma-events/tests/pdu.rs b/ruma-events/tests/pdu.rs
index c317843f..0caac3f3 100644
--- a/ruma-events/tests/pdu.rs
+++ b/ruma-events/tests/pdu.rs
@@ -54,7 +54,7 @@ fn serialize_pdu_as_v1() {
         "event_id": "$somejoinevent:matrix.org",
         "sender": "@sender:example.com",
         "origin": "matrix.org",
-        "origin_server_ts": 1_592_050_773_658usize,
+        "origin_server_ts": 1_592_050_773_658u64,
         "type": "m.room.power_levels",
         "content": {
             "testing": 123
@@ -113,7 +113,7 @@ fn serialize_pdu_as_v3() {
         "room_id": "!n8f893n9:example.com",
         "sender": "@sender:example.com",
         "origin": "matrix.org",
-        "origin_server_ts": 1_592_050_773_658usize,
+        "origin_server_ts": 1_592_050_773_658u64,
         "type": "m.room.power_levels",
         "content": {
             "testing": 123