diff --git a/services/std_svc/spmd/spmd.mk b/services/std_svc/spmd/spmd.mk
index 73f7c85..8efbdc8 100644
--- a/services/std_svc/spmd/spmd.mk
+++ b/services/std_svc/spmd/spmd.mk
@@ -1,11 +1,15 @@
 #
-# Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 ifneq (${ARCH},aarch64)
-        $(error "Error: SPMD is only supported on aarch64.")
+	$(error "Error: SPMD is only supported on aarch64.")
+endif
+
+ifeq (${ENABLE_SME_FOR_NS},1)
+	$(error "Error: SPMD is not compatible with ENABLE_SME_FOR_NS")
 endif
 
 SPMD_SOURCES	+=	$(addprefix services/std_svc/spmd/,	\