diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index d156bfbffa9a..6643f3f994fb 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/percpu.h>
+#include <linux/start_kernel.h>
 
 #include <asm/processor.h>
 #include <asm/proto.h>
diff --git a/include/asm-x86/proto.h b/include/asm-x86/proto.h
index 4eddf2761804..5a45478b5d3a 100644
--- a/include/asm-x86/proto.h
+++ b/include/asm-x86/proto.h
@@ -8,8 +8,6 @@
 struct cpuinfo_x86; 
 struct pt_regs;
 
-extern void start_kernel(void);
-
 extern void early_idt_handler(void);
 
 extern void init_memory_mapping(unsigned long start, unsigned long end);