diff --git a/src/xenia/base/testing/chrono_test.cc b/src/xenia/base/testing/chrono_test.cc
index a63aac53c..f35f17ed8 100644
--- a/src/xenia/base/testing/chrono_test.cc
+++ b/src/xenia/base/testing/chrono_test.cc
@@ -107,10 +107,11 @@ TEST_CASE("WinSystemClock <-> XSystemClock", "[clock_cast]") {
     auto error2 = xsys.time_since_epoch() - wxsys.time_since_epoch();
     auto error3 = wsys - wxsys;
 
-    REQUIRE(error1 < 10ms);
-    REQUIRE(error1 > -10ms);
-    REQUIRE(error2 < 10ms);
-    REQUIRE(error2 > -10ms);
+    // In AppVeyor, the difference often can be as large as roughly 16ms.
+    REQUIRE(error1 < 20ms);
+    REQUIRE(error1 > -20ms);
+    REQUIRE(error2 < 20ms);
+    REQUIRE(error2 > -20ms);
     REQUIRE(error3 < duration);
     REQUIRE(error3 > -duration);
   }