diff --git a/templates/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh.template b/templates/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh.template
index acf12579357..79a6262beb5 100644
--- a/templates/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh.template
+++ b/templates/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh.template
@@ -39,4 +39,6 @@
     ln -s $(pwd)/.dotnet/dotnet /usr/local/bin/dotnet
   fi
 
-  dotnet build --configuration Debug Grpc.DotNet.sln
+  # Cloning from a local path sets RepositoryUrl to a path and breaks Source Link.
+  # Override RepositoryUrl to a URL to fix Source Link. The value doesn't matter.
+  dotnet build --configuration Debug Grpc.DotNet.sln -p:RepositoryUrl=https://github.com/grpc/grpc-dotnet.git
diff --git a/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh b/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh
index acb2a0ab2d9..31f21ce7839 100644
--- a/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh
+++ b/tools/dockerfile/interoptest/grpc_interop_aspnetcore/build_interop.sh
@@ -37,4 +37,6 @@ then
   ln -s $(pwd)/.dotnet/dotnet /usr/local/bin/dotnet
 fi
 
-dotnet build --configuration Debug Grpc.DotNet.sln
+# Cloning from a local path sets RepositoryUrl to a path and breaks Source Link.
+# Override RepositoryUrl to a URL to fix Source Link. The value doesn't matter.
+dotnet build --configuration Debug Grpc.DotNet.sln -p:RepositoryUrl=https://github.com/grpc/grpc-dotnet.git