diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b59fc23..a4a9ccc 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -45,6 +45,7 @@
 #include <asm/sections.h>
 #include <asm/kdebug.h>
 #include <asm/numa.h>
+#include <asm/cacheflush.h>
 
 const struct dma_mapping_ops *dma_ops;
 EXPORT_SYMBOL(dma_ops);