diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
index a3efcc34aa0d..280b40e55ae6 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
@@ -165,6 +165,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <!-- controls warn as error -->
     <_BinaryFormatterObsoleteAsError>true</_BinaryFormatterObsoleteAsError>
     <!-- controls runtime behavior (AppContext & trimming) -->
+    <EnableUnsafeBinaryFormatterSerialization Condition="'$(EnableUnsafeBinaryFormatterSerialization)' == '' AND '$(_ProjectTypeRequiresBinaryFormatter)' == 'true'">true</EnableUnsafeBinaryFormatterSerialization>
     <EnableUnsafeBinaryFormatterSerialization Condition="$([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '8.0')) AND '$(_ProjectTypeRequiresBinaryFormatter)' != 'true'">false</EnableUnsafeBinaryFormatterSerialization>
   </PropertyGroup>