diff --git a/lib/psci/psci_main.c b/lib/psci/psci_main.c
index 7ac0e02..45be63a 100644
--- a/lib/psci/psci_main.c
+++ b/lib/psci/psci_main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2024, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -8,6 +8,7 @@
 #include <string.h>
 
 #include <arch.h>
+#include <arch_features.h>
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <lib/pmf/pmf.h>
@@ -64,6 +65,19 @@
 	plat_local_state_t prev[PLAT_MAX_PWR_LVL];
 #endif
 
+#if ERRATA_SME_POWER_DOWN
+	/*
+	 * If SME isn't off, attempting a real power down will only end up being
+	 * rejected. If we got called with SME on, fall back to a normal
+	 * suspend. We can't force SME off as in the event the power down is
+	 * rejected for another reason (eg GIC) we'd lose the SME context.
+	 */
+	if (is_feat_sme_supported() && read_svcr() != 0) {
+		power_state &= ~(PSTATE_TYPE_MASK << PSTATE_TYPE_SHIFT);
+		power_state &= ~(PSTATE_PWR_LVL_MASK << PSTATE_PWR_LVL_SHIFT);
+	}
+#endif /* ERRATA_SME_POWER_DOWN */
+
 	/* Validate the power_state parameter */
 	rc = psci_validate_power_state(power_state, &state_info);
 	if (rc != PSCI_E_SUCCESS) {