diff --git a/include/linux/dax.h b/include/linux/dax.h
index 90fbc99..72dc81d 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -29,7 +29,7 @@
 }
 #endif
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
 				unsigned int flags, get_block_t);
 int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,