diff --git a/tests/periph_ptp_clock/main.c b/tests/periph_ptp_clock/main.c
index ef7a21d247..425573fcf1 100644
--- a/tests/periph_ptp_clock/main.c
+++ b/tests/periph_ptp_clock/main.c
@@ -67,7 +67,8 @@ static int test_speed_adjustment(const int32_t speed)
     print_str(" (~");
     {
         int64_t tmp = speed * 100000ULL;
-        tmp /= UINT32_MAX;
+        /* trusting compiler to use arithmetic right shift, when available instead of division */
+        tmp /= 1LL << 32;
         tmp += 100000ULL;
         char output[16];
         print(output, fmt_s32_dfp(output, (int32_t)tmp, -3));