diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index 22b4f8dfcd..2a259ea8a9 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -1703,8 +1703,17 @@ TEST_CASE("wxDateTime-BST-bugs", "[datetime][dst][BST][.]")
 
 TEST_CASE("wxDateTime::UNow", "[datetime][now][unow]")
 {
-    const wxDateTime now = wxDateTime::Now();
-    const wxDateTime unow = wxDateTime::UNow();
+    // It's unlikely, but possible, that the consecutive functions are called
+    // on different sides of some second boundary, but it really shouldn't
+    // happen more than once in a row.
+    wxDateTime now, unow;
+    for ( int i = 0; i < 3; ++i )
+    {
+        now = wxDateTime::Now();
+        unow = wxDateTime::UNow();
+        if ( now.GetSecond() == unow.GetSecond() )
+            break;
+    }
 
     CHECK( now.GetYear() == unow.GetYear() );
     CHECK( now.GetMonth() == unow.GetMonth() );