diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index c10102a..b8e3d99 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -1414,6 +1414,7 @@
 #define DSU_CLUSTER_PWR_OFF	0
 #define DSU_CLUSTER_PWR_ON	1
 #define DSU_CLUSTER_PWR_MASK	U(1)
+#define DSU_CLUSTER_MEM_RET	BIT(1)
 
 /*******************************************************************************
  * Definitions for CPU Power/Performance Management registers