diff --git a/lib/optee_clientApi/OpteeClientMem.c b/lib/optee_clientApi/OpteeClientMem.c
index 7ecb769e3e..969a5bb348 100644
--- a/lib/optee_clientApi/OpteeClientMem.c
+++ b/lib/optee_clientApi/OpteeClientMem.c
@@ -132,7 +132,7 @@ void OpteeClientMemInit(void)
 	ARM_SMC_ARGS ArmSmcArgs = {0};
 
 #ifdef CONFIG_OPTEE_V1
-	ArmSmcArgs.Arg0 = TEESMC_OPTEE_FUNCID_GET_SHM_CONFIG;
+	ArmSmcArgs.Arg0 = TEESMC32_OPTEE_FASTCALL_GET_SHM_CONFIG;
 #endif
 #ifdef CONFIG_OPTEE_V2
 	ArmSmcArgs.Arg0 = OPTEE_SMC_GET_SHM_CONFIG_V2;