diff --git a/reactos/hal/hal.pspec b/reactos/hal/hal.pspec
index 68060f1e293..786372d9e3d 100644
--- a/reactos/hal/hal.pspec
+++ b/reactos/hal/hal.pspec
@@ -101,3 +101,4 @@
 @ stdcall -arch=i386,arm WRITE_PORT_UCHAR(ptr long)
 @ stdcall -arch=i386,arm WRITE_PORT_ULONG(ptr long)
 @ stdcall -arch=i386,arm WRITE_PORT_USHORT(ptr long)
+@ stdcall -arch=x86_64 HalInitializeBios(long ptr)