diff --git a/dlls/hal/hal.c b/dlls/hal/hal.c
index 96bc895675d..bca688e54e8 100644
--- a/dlls/hal/hal.c
+++ b/dlls/hal/hal.c
@@ -155,3 +155,9 @@ KIRQL WINAPI KeGetCurrentIrql(VOID)
     FIXME( " stub!\n");
     return 0;
 }
+
+ULONG WINAPI READ_PORT_ULONG(ULONG *port)
+{
+    FIXME("(%p) stub!\n", port);
+    return 0;
+}
diff --git a/dlls/hal/hal.spec b/dlls/hal/hal.spec
index 3046c65061c..02f778cb17e 100644
--- a/dlls/hal/hal.spec
+++ b/dlls/hal/hal.spec
@@ -82,7 +82,7 @@
 @ stub READ_PORT_BUFFER_ULONG
 @ stub READ_PORT_BUFFER_USHORT
 @ stub READ_PORT_UCHAR
-@ stub READ_PORT_ULONG
+@ stdcall READ_PORT_ULONG(ptr)
 @ stub READ_PORT_USHORT
 @ stub WRITE_PORT_BUFFER_UCHAR
 @ stub WRITE_PORT_BUFFER_ULONG