diff --git a/services/spd/trusty/generic-arm64-smcall.h b/services/spd/trusty/generic-arm64-smcall.h
index 06efc72..ac03469 100644
--- a/services/spd/trusty/generic-arm64-smcall.h
+++ b/services/spd/trusty/generic-arm64-smcall.h
@@ -23,5 +23,6 @@
  */
 #define SMC_GET_GIC_BASE_GICD	0
 #define SMC_GET_GIC_BASE_GICC	1
+#define SMC_GET_GIC_BASE_GICR	2
 #define SMC_FC_GET_REG_BASE	SMC_FASTCALL_NR(SMC_ENTITY_PLATFORM_MONITOR, 0x1)
 #define SMC_FC64_GET_REG_BASE	SMC_FASTCALL64_NR(SMC_ENTITY_PLATFORM_MONITOR, 0x1)