diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b5ac9932bcf6..a58498364cac 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -35,6 +35,7 @@
 #include <asm/kaslr.h>
 #include <asm/mce.h>
 #include <asm/mtrr.h>
+#include <asm/realmode.h>
 #include <asm/olpc_ofw.h>
 #include <asm/pci-direct.h>
 #include <asm/prom.h>