diff --git a/xtoskrnl/xtoskrnl.spec b/xtoskrnl/xtoskrnl.spec
index c8bb90e..7b1d60b 100644
--- a/xtoskrnl/xtoskrnl.spec
+++ b/xtoskrnl/xtoskrnl.spec
@@ -1,3 +1,6 @@
+@ fastcall ExAcquireRundownProtection(ptr)
+@ fastcall ExInitializeRundownProtection(ptr)
+@ fastcall ExReleaseRundownProtection(ptr)
 @ cdecl HlIoPortInByte(ptr)
 @ cdecl HlIoPortInLong(ptr)
 @ cdecl HlIoPortInShort(ptr)