diff --git a/reactos/hal/halx86/include/halirq.h b/reactos/hal/halx86/include/halirq.h
index 8bde9191f02..5304f5d1f6b 100644
--- a/reactos/hal/halx86/include/halirq.h
+++ b/reactos/hal/halx86/include/halirq.h
@@ -4,6 +4,12 @@
 
 #pragma once
 
+#ifdef _MINIHAL_
+#define VECTOR2IRQ(vector)	((vector) - PRIMARY_VECTOR_BASE)
+#define VECTOR2IRQL(vector)	(PROFILE_LEVEL - VECTOR2IRQ(vector))
+#define IRQ2VECTOR(irq)		((irq) + PRIMARY_VECTOR_BASE)
+#else
+
 UCHAR
 FASTCALL
 HalpIrqToVector(UCHAR Irq);
@@ -20,3 +26,4 @@ HalpVectorToIrq(UCHAR Vector);
 #define VECTOR2IRQL(vector)	HalpVectorToIrql(vector)
 #define IRQ2VECTOR(irq)		HalpIrqToVector(irq)
 
+#endif