diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index 5d03792d4f65..5b526357d178 100644
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -30,6 +30,8 @@
 
 #ifdef __KERNEL__
 
+#include <acpi/pdc_intel.h>
+
 #include <linux/init.h>
 #include <linux/numa.h>
 #include <asm/system.h>
@@ -119,11 +121,6 @@ extern int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
 extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
 #endif
 
-/*
- * Refer Intel ACPI _PDC support document for bit definitions
- */
-#define ACPI_PDC_EST_CAPABILITY_SMP     0x8
-
 #endif /*__KERNEL__*/
 
 #endif /*_ASM_ACPI_H*/