diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e8de77..a04e0e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -59,6 +59,9 @@ jobs:
             @test startswith(UserNSSandbox_jll.sandbox_path, Scratch.scratch_dir())
           '
         if: ${{ matrix.build-sandbox != '' }}
+      - name: Set preferences for test project
+        run: sed 's/\[\(.*\)\]/[preferences.\1]/' LocalPreferences.toml >> test/Project.toml
+        if: ${{ matrix.build-sandbox != '' }}
       - uses: julia-actions/julia-runtest@v1
 
   Documentation:
diff --git a/test/Project.toml b/test/Project.toml
index 851c3fb..f4a5523 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -6,3 +6,4 @@
 Artifacts = "56f22d72-fd6d-98f1-02f0-08ddc0907c33"
 Scratch = "6c6a2e73-6563-6170-7368-637461726353"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+UserNSSandbox_jll = "b88861f7-1d72-59dd-91e7-a8cc876a4984"
diff --git a/test/runtests.jl b/test/runtests.jl
index 235af5c..d18570b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,4 +1,4 @@
-using Test, Sandbox
+using Test, Sandbox, UserNSSandbox_jll
 
 include("SandboxConfig.jl")
 include("UserNamespaces.jl")