diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1013a42..0986d19 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -940,7 +940,9 @@
 
 /* Do stack extension */
 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
+#ifdef CONFIG_IA64
 extern int expand_upwards(struct vm_area_struct *vma, unsigned long address);
+#endif
 
 /* Look up the first VMA which satisfies  addr < vm_end,  NULL if none. */
 extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr);