diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h
index 03220e6a064..5e2f11bc513 100644
--- a/sys/amd64/include/md_var.h
+++ b/sys/amd64/include/md_var.h
@@ -57,7 +57,7 @@ extern	int	szsigcode;
 extern	uint64_t *vm_page_dump;
 extern	int	vm_page_dump_size;
 
-extern	struct pcpu __pcpu[];
+extern	struct pcpu *__pcpu;
 
 typedef void alias_for_inthand_t(u_int cs, u_int ef, u_int esp, u_int ss);
 struct	thread;