diff --git a/AoC2021.csproj b/AoC2021.csproj
index e78d5e5..6be728d 100644
--- a/AoC2021.csproj
+++ b/AoC2021.csproj
@@ -6,6 +6,7 @@
         <LangVersion>10</LangVersion>
         <ImplicitUsings>true</ImplicitUsings>
         <Nullable>enable</Nullable>
+        <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
     </PropertyGroup>
 
 </Project>