diff --git a/mm/truncate.c b/mm/truncate.c
index cd3e34b..8fde658 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -35,8 +35,10 @@
 {
 	void (*invalidatepage)(struct page *, unsigned long);
 	invalidatepage = page->mapping->a_ops->invalidatepage;
+#ifdef CONFIG_BLOCK
 	if (!invalidatepage)
 		invalidatepage = block_invalidatepage;
+#endif
 	if (invalidatepage)
 		(*invalidatepage)(page, offset);
 }