diff --git a/tests/periph/timer/main.c b/tests/periph/timer/main.c
index 132677dc90..0071119a28 100644
--- a/tests/periph/timer/main.c
+++ b/tests/periph/timer/main.c
@@ -249,6 +249,8 @@ static void print_supported_frequencies(tim_t dev)
                "    %u: %" PRIu32 "\n",
                (unsigned)(end - 1), timer_query_freqs(dev, end - 1));
     }
+
+    expect(timer_query_freqs(dev, end) == 0);
 }
 
 int main(void)