diff --git a/dlls/ntdll/unix/loader.c b/dlls/ntdll/unix/loader.c
index cde37c48b0d..be237bc0ad3 100644
--- a/dlls/ntdll/unix/loader.c
+++ b/dlls/ntdll/unix/loader.c
@@ -65,6 +65,7 @@
 # undef LoadResource
 # undef GetCurrentThread
 # include <pthread.h>
+# include <pthread/qos.h>
 # include <mach/mach.h>
 # include <mach/mach_error.h>
 # include <mach-o/getsect.h>