diff --git a/src/sys.zig b/src/sys.zig
index e857989..8f86a17 100644
--- a/src/sys.zig
+++ b/src/sys.zig
@@ -54,7 +54,7 @@ pub const EventLoop = opaque {
     ///
     const Implementation = struct {
         user_prefix: []const u8,
-        file_system_semaphore: *ext.SDL_Semaphore,
+        file_system_semaphore: *ext.SDL_sem,
         file_system_thread: *ext.SDL_Thread,
         file_system_messages: ?*FileSystemMessage = null,
 
@@ -495,13 +495,13 @@ pub fn runGraphics(comptime Errors: anytype, run: GraphicsRunner(Errors)) Errors
 
     var event_loop = EventLoop.Implementation{
         .file_system_semaphore = ext.SDL_CreateSemaphore(0) orelse return error.InitFailure,
-
-        .file_system_thread = ext.SDL_CreateThread(EventLoop.processFileSystemMessages,
-            "File System Worker", &event_loop) orelse return error.InitFailure,
-
+        .file_system_thread = unreachable,
         .user_prefix = pref_path,
     };
 
+    event_loop.file_system_thread = ext.SDL_CreateThread(EventLoop.processFileSystemMessages,
+            "File System Worker", &event_loop) orelse return error.InitFailure;
+
     defer {
         ext.SDL_DestroyThread(event_loop.file_system_thread);
         ext.SDL_DestroySemaphore(event_loop.file_system_semaphore);