diff --git a/Duplicati/UnitTest/TestUtils.cs b/Duplicati/UnitTest/TestUtils.cs
index a09a0e912..68fa80d1e 100644
--- a/Duplicati/UnitTest/TestUtils.cs
+++ b/Duplicati/UnitTest/TestUtils.cs
@@ -245,10 +245,10 @@ namespace Duplicati.UnitTest
             // Compare file metadata
             if (verifymetadata)
             {
-                // OSX seem to like to actually set the time to some value earlier than what you set by tens of milliseconds.
+                // macOS seem to like to actually set the time to some value different than what you set by hundreds of milliseconds.
                 // Reading the time right after it is set gives the expected value but when read later it is slightly different.
                 // Maybe a bug in .net?
-                int granularity = Platform.IsClientOSX ? 500 : 1;
+                int granularity = Platform.IsClientOSX ? 999 : 1;
                 Assert.That(
                     SystemIO.IO_OS.GetLastWriteTimeUtc(actualFile),
                     Is.EqualTo(SystemIO.IO_OS.GetLastWriteTimeUtc(expectedFile)).Within(granularity).Milliseconds,