diff --git a/Tests/CustomDumpTests/DiffTests.swift b/Tests/CustomDumpTests/DiffTests.swift
index 4eda262..cb4797f 100644
--- a/Tests/CustomDumpTests/DiffTests.swift
+++ b/Tests/CustomDumpTests/DiffTests.swift
@@ -1147,8 +1147,8 @@ final class DiffTests: XCTestCase {
     }
     XCTAssertNoDifference(
       diff(
-        State(date: 123456789, results: Results()),
-        State(date: 123456790, results: Results())
+        State(date: 123_456_789, results: Results()),
+        State(date: 123_456_790, results: Results())
       ),
       """
         DiffTests.State(