diff --git a/src/SourceBuild/patches/runtime/0003-dont-consider-linux-bionic-cross-build.patch b/src/SourceBuild/patches/runtime/0003-dont-consider-linux-bionic-cross-build.patch
new file mode 100644
index 000000000000..f6dc0447159f
--- /dev/null
+++ b/src/SourceBuild/patches/runtime/0003-dont-consider-linux-bionic-cross-build.patch
@@ -0,0 +1,23 @@
+From 1bc1910ad1a68cac8fc71eb48fa4dfb5e56ca775 Mon Sep 17 00:00:00 2001
+From: Jeremy Koritzinsky <jekoritz@microsoft.com>
+Date: Thu, 17 Apr 2025 09:22:28 -0700
+Subject: [PATCH] Don't consider linux-bionic as a cross-build in UB builds
+
+Backport: https://github.com/dotnet/runtime/pull/114787
+---
+ eng/DotNetBuild.props | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/eng/DotNetBuild.props b/eng/DotNetBuild.props
+index 1e3137ec241e4f..86afe915029d8a 100644
+--- a/eng/DotNetBuild.props
++++ b/eng/DotNetBuild.props
+@@ -34,7 +34,7 @@
+       <InnerBuildArgs Condition="'$(_portableOS)' == 'win'">$(InnerBuildArgs) $(FlagParameterPrefix)os windows</InnerBuildArgs>
+       <InnerBuildArgs Condition="'$(_portableOS)' != 'win'">$(InnerBuildArgs) $(FlagParameterPrefix)os $(_portableOS)</InnerBuildArgs>
+       <!-- Mobile builds are never "cross" builds as they don't have a rootfs-based filesystem build. -->
+-      <InnerBuildArgs Condition="'$(CrossBuild)' == 'true' or ('$(TargetArchitecture)' != '$(BuildArchitecture)' and '$(TargetsMobile)' != 'true')">$(InnerBuildArgs) $(FlagParameterPrefix)cross</InnerBuildArgs>
++      <InnerBuildArgs Condition="'$(CrossBuild)' == 'true' or ('$(TargetArchitecture)' != '$(BuildArchitecture)' and '$(TargetsMobile)' != 'true' and '$(_portableOS)' != 'linux-bionic')">$(InnerBuildArgs) $(FlagParameterPrefix)cross</InnerBuildArgs>
+       <InnerBuildArgs>$(InnerBuildArgs) $(FlagParameterPrefix)configuration $(Configuration)</InnerBuildArgs>
+       <InnerBuildArgs>$(InnerBuildArgs) $(FlagParameterPrefix)verbosity $(LogVerbosity)</InnerBuildArgs>
+       <InnerBuildArgs>$(InnerBuildArgs) $(FlagParameterPrefix)nodereuse $(ArcadeFalseBoolBuildArg)</InnerBuildArgs>