diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h
index 14411c9de46f8f1f22434759c91b4ad892d17227..73ce5b32443ff0e8fda659ac70e3de7d0062d01a 100644
--- a/include/asm-x86/acpi.h
+++ b/include/asm-x86/acpi.h
@@ -28,6 +28,7 @@
 #include <asm/numa.h>
 #include <asm/processor.h>
 #include <asm/mmu.h>
+#include <asm/mpspec.h>
 
 #define COMPILER_DEPENDENT_INT64   long long
 #define COMPILER_DEPENDENT_UINT64  unsigned long long