diff --git a/src/sys.zig b/src/sys.zig
index b880fef..f583974 100644
--- a/src/sys.zig
+++ b/src/sys.zig
@@ -613,7 +613,7 @@ pub fn runGraphics(comptime Errors: anytype, run: GraphicsRunner(Errors)) Errors
 
     defer {
         ext.SDL_DestroyThread(event_loop.file_system_thread);
-        ext.SDL_DestroySemaphore(event_loop.file_system_mutex);
+        ext.SDL_DestroyMutex(event_loop.file_system_mutex);
         ext.SDL_DestroySemaphore(event_loop.file_system_semaphore);
     }