diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index 9016b0d..ceb7024 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -536,8 +536,8 @@
 	}
 
 	/* Sticky lock OTP_IWDG (read and write) */
-	if (!bsec_write_sr_lock(HW2_OTP, 1U) ||
-	    !bsec_write_sw_lock(HW2_OTP, 1U)) {
+	if ((bsec_set_sr_lock(HW2_OTP) != BSEC_OK) ||
+	    (bsec_set_sw_lock(HW2_OTP) != BSEC_OK)) {
 		return BSEC_LOCK_FAIL;
 	}