diff --git a/include/arch/aarch64/asm_macros.S b/include/arch/aarch64/asm_macros.S
index 00e482b..197ea06 100644
--- a/include/arch/aarch64/asm_macros.S
+++ b/include/arch/aarch64/asm_macros.S
@@ -262,6 +262,10 @@
 	hint #17 /* use the hint synonym for compatibility */
 	.endm
 
+	.macro tsb_csync
+	hint #18 /* use the hint synonym for compatibility */
+	.endm
+
 	/*
 	 * Macro for using speculation barrier instruction introduced by
 	 * FEAT_SB, if it's enabled.