diff --git a/examples/system/ulp_adc/example_test.py b/examples/system/ulp_adc/example_test.py
index 87192f51dd..87184ede56 100644
--- a/examples/system/ulp_adc/example_test.py
+++ b/examples/system/ulp_adc/example_test.py
@@ -16,10 +16,14 @@ def test_examples_ulp_adc(env, extra_data):
 
     for _ in range(5):
         dut.expect('Deep sleep wakeup', timeout=60)
-        measurements = int(dut.expect(re.compile(r'ULP did (\d+) measurements'), timeout=5)[0], 10)
+        measurements_str = dut.expect(re.compile(r'ULP did (\d+) measurements'), timeout=5)[0]
+        assert measurements_str is not None
+        measurements = int(measurements_str)
         Utility.console_log('ULP did {} measurements'.format(measurements))
         dut.expect('Thresholds:  low=1500  high=2000', timeout=5)
-        value = int(dut.expect(re.compile(r'Value=(\d+) was (?:below)|(?:above) threshold'), timeout=5)[0], 10)
+        value_str = dut.expect(re.compile(r'Value=(\d+) was (above|below) threshold'), timeout=5)[0]
+        assert value_str is not None
+        value = int(value_str)
         Utility.console_log('Value {} was outside the boundaries'.format(value))
         dut.expect('Entering deep sleep', timeout=60)