diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index 6c9af98035..aa0a96c602 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -1743,6 +1743,8 @@ TEST_CASE("wxDateTime::UNow", "[datetime][now][unow]")
             gotMS = true;
             break;
         }
+
+        wxMilliSleep(123);
     }
 
     CHECK( gotMS );