diff --git a/tests/m48t59-test.c b/tests/m48t59-test.c
index 5179681ca5a842972fa3c67faea600f3f080c0aa..d79f55472dda724c3a099d1b7f794beff4a25032 100644
--- a/tests/m48t59-test.c
+++ b/tests/m48t59-test.c
@@ -233,6 +233,11 @@ static void fuzz_registers(void)
         reg = (uint8_t)g_test_rand_int_range(0, 16);
         val = (uint8_t)g_test_rand_int_range(0, 256);
 
+        if (reg == 7) {
+            /* watchdog setup register, may trigger system reset, skip */
+            continue;
+        }
+
         cmos_write(reg, val);
         cmos_read(reg);
     }