diff --git a/arch/alpha/include/asm/tlbflush.h b/arch/alpha/include/asm/tlbflush.h
index 0c8529997f54..9ae1902faf8e 100644
--- a/arch/alpha/include/asm/tlbflush.h
+++ b/arch/alpha/include/asm/tlbflush.h
@@ -87,7 +87,8 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
 {
 	struct mm_struct *mm = vma->vm_mm;
 
-	if (mm == current->active_mm)
+	/* A targeted tbi() needs a thread of MM to be current.  */
+	if (mm == current->mm)
 		flush_tlb_current_page(mm, vma, addr);
 	else
 		flush_tlb_other(mm);