diff --git a/dlls/ucrtbase/tests/misc.c b/dlls/ucrtbase/tests/misc.c
index bf4b2a0e37b..cdf3820dccb 100644
--- a/dlls/ucrtbase/tests/misc.c
+++ b/dlls/ucrtbase/tests/misc.c
@@ -996,6 +996,9 @@ static void test_strftime(void)
         { "%X", "0", 0, 0, L"m", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }},
         { "%X", "00", 0, 0, L"mm", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }},
         { "%X", "m00", 0, 0, L"mmm", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }, TRUE},
+        { "%X", "0", 0, 0, L"s", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }},
+        { "%X", "00", 0, 0, L"ss", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }},
+        { "%X", "s00", 0, 0, L"sss", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }, TRUE},
         { "%X", "T", 0, 0, L"t", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }, TRUE},
         { "%X", "TAM", 0, 0, L"tt", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }, TRUE},
         { "%X", "TAM", 0, 0, L"ttttttttt", { 0, 0, 0, 1, 0, 70, 0, 0, 0 }, TRUE},