diff --git a/include/asm-x86_64/irq.h b/include/asm-x86_64/irq.h
index fb724ba37ae6..9db5a1b4f7b1 100644
--- a/include/asm-x86_64/irq.h
+++ b/include/asm-x86_64/irq.h
@@ -36,7 +36,7 @@
 #define NR_IRQ_VECTORS NR_IRQS
 #else
 #define NR_IRQS 224
-#define NR_IRQ_VECTORS 1024
+#define NR_IRQ_VECTORS (32 * NR_CPUS)
 #endif
 
 static __inline__ int irq_canonicalize(int irq)