diff --git a/src/libraries/System.Formats.Nrbf/tests/System.Formats.Nrbf.Tests.csproj b/src/libraries/System.Formats.Nrbf/tests/System.Formats.Nrbf.Tests.csproj
index 723ac62a3b9abb..0ed91d1cce808f 100644
--- a/src/libraries/System.Formats.Nrbf/tests/System.Formats.Nrbf.Tests.csproj
+++ b/src/libraries/System.Formats.Nrbf/tests/System.Formats.Nrbf.Tests.csproj
@@ -3,6 +3,8 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetFrameworkCurrent)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
+    <!-- https://github.com/dotnet/runtime/issues/128079 -->
+    <IgnoreForCI Condition="'$(RuntimeFlavor)' == 'Mono'">true</IgnoreForCI>
     <!-- https://github.com/dotnet/runtime/issues/126862 -->
     <EnableTrimAnalyzer>false</EnableTrimAnalyzer>
     <EnableAotAnalyzer>false</EnableAotAnalyzer>