# V605\. Unsigned value is compared to the NN number\. Consider inspecting the expression\.

The analyzer has detected a potential error in an expression where an unsigned variable is compared to a negative number\. This is a rather rare situation and such a comparison is not always an error\. However, getting the V605 warning is a good reason to review the code\.

This is an example of code the V605 warning will be generated for:

```cpp
unsigned u = ...;
if (u < -1)
{ ... }
```