diff --git a/include/common/aarch64/asm_macros.S b/include/common/aarch64/asm_macros.S
index 88e8d9c..b0f3a0d 100644
--- a/include/common/aarch64/asm_macros.S
+++ b/include/common/aarch64/asm_macros.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -32,6 +32,7 @@
 
 #include <arch.h>
 #include <asm_macros_common.S>
+#include <spinlock.h>
 
 
 	.macro	func_prologue
@@ -200,4 +201,13 @@
 #endif
 	.endm
 
+	/*
+	 * Reserve space for a spin lock in assembly file.
+	 */
+	.macro define_asm_spinlock _name:req
+	.align	SPINLOCK_ASM_ALIGN
+	\_name:
+	.space	SPINLOCK_ASM_SIZE
+	.endm
+
 #endif /* __ASM_MACROS_S__ */