diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h
index 36b766cfc4d5630992c14e374d3a550fab7a54eb..e16d76c9deb0dfceb290181a3835c393d49813ad 100644
--- a/include/asm-x86_64/pda.h
+++ b/include/asm-x86_64/pda.h
@@ -22,7 +22,7 @@ struct x8664_pda {
 	struct mm_struct *active_mm;
 	int mmu_state;     
 	unsigned apic_timer_irqs;
-} ____cacheline_aligned;
+} ____cacheline_aligned_in_smp;
 
 
 #define IRQSTACK_ORDER 2