diff --git a/reactos/ntoskrnl/include/internal/amd64/intrin_i.h b/reactos/ntoskrnl/include/internal/amd64/intrin_i.h
index 7da484c15f9..a09c4acdc31 100644
--- a/reactos/ntoskrnl/include/internal/amd64/intrin_i.h
+++ b/reactos/ntoskrnl/include/internal/amd64/intrin_i.h
@@ -7,6 +7,8 @@
 #define LOCK ""
 #endif
 
+#define KeSetCurrentIrql(x) __writecr8(x)
+
 #if defined(__GNUC__)
 
 #define Ke386SetInterruptDescriptorTable(X) \