diff --git a/arch/arm/mach-stm32mp/stm32mp1/stm32mp15x.c b/arch/arm/mach-stm32mp/stm32mp1/stm32mp15x.c
index f096fe5..ca202be 100644
--- a/arch/arm/mach-stm32mp/stm32mp1/stm32mp15x.c
+++ b/arch/arm/mach-stm32mp/stm32mp1/stm32mp15x.c
@@ -148,8 +148,8 @@
 	 */
 	clrsetbits_le32(TAMP_SMCR,
 			TAMP_SMCR_BKPRWDPROT | TAMP_SMCR_BKPWDPROT,
-			FIELD_PREP(TAMP_SMCR_BKPRWDPROT, 0x20) |
-			FIELD_PREP(TAMP_SMCR_BKPWDPROT, 0x20));
+			FIELD_PREP(TAMP_SMCR_BKPRWDPROT, 0x0A) |
+			FIELD_PREP(TAMP_SMCR_BKPWDPROT, 0x0F));
 
 	/* GPIOZ: deactivate the security */
 	writel(BIT(0), RCC_MP_AHB5ENSETR);