diff --git a/tests/ADC/test_ADC.cpp b/tests/ADC/test_ADC.cpp
index 1c5c03c..04f1f6d 100644
--- a/tests/ADC/test_ADC.cpp
+++ b/tests/ADC/test_ADC.cpp
@@ -154,9 +154,10 @@ TEST(test_ADC, ADC_ReadValueImplimentationTimesOut)
         .withPointerParameter("reg", (void *) &ADCSRA)
         .withUnsignedIntParameter("bit_num", ADSC);
 
-    //Check that it does return a value.
+    //Check that it return the "error" value
 
-    ADC_ReadValue(0);
+    uint16_t value = ADC_ReadValue(0);
+    CHECK_EQUAL_TEXT(UINT16_MAX, value, "ERROR: Should return UINT16_MAX!");
 }