From 05aeb8e7806e843b0714d23997a4aa1b982cef33 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Thu, 24 Jul 2025 17:16:52 +0200
Subject: [PATCH] [Preferences] Fix use of symbol for _PREFERENCE_THREADING

---
 src/Trixi.jl          | 2 +-
 src/auxiliary/math.jl | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Trixi.jl b/src/Trixi.jl
index 6f31873a721..28d32535be7 100644
--- a/src/Trixi.jl
+++ b/src/Trixi.jl
@@ -18,7 +18,7 @@ module Trixi
 using Preferences: @load_preference, set_preferences!
 const _PREFERENCE_SQRT = @load_preference("sqrt", "sqrt_Trixi_NaN")
 const _PREFERENCE_LOG = @load_preference("log", "log_Trixi_NaN")
-const _PREFERENCE_THREADING = @load_preference("backend", :polyester)
+const _PREFERENCE_THREADING = Symbol(@load_preference("backend", "polyester"))
 const _PREFERENCE_LOOPVECTORIZATION = @load_preference("loop_vectorization", true)
 
 # Include other packages that are used in Trixi.jl
diff --git a/src/auxiliary/math.jl b/src/auxiliary/math.jl
index fbebf4a9479..e2fcab85fa0 100644
--- a/src/auxiliary/math.jl
+++ b/src/auxiliary/math.jl
@@ -27,7 +27,7 @@ function set_threading_backend!(backend::Symbol = :polyester; force = true)
     if !(backend in valid_backends)
         throw(ArgumentError("Invalid threading backend: $(backend). Current options are: $(join(valid_backends, ", "))"))
     end
-    set_preferences!(TRIXI_UUID, "backend" => backend, force = force)
+    set_preferences!(TRIXI_UUID, "backend" => string(backend), force = force)
     @info "Please restart Julia and reload Trixi.jl for the `backend` change to take effect"
 end