diff --git a/plat/intel/soc/common/socfpga_sip_svc.c b/plat/intel/soc/common/socfpga_sip_svc.c
index 529bbbc..66dd6cd 100644
--- a/plat/intel/soc/common/socfpga_sip_svc.c
+++ b/plat/intel/soc/common/socfpga_sip_svc.c
@@ -344,7 +344,7 @@
 {
 	if (!intel_secure_reg_read(reg_addr, retval)) {
 		*retval &= ~mask;
-		*retval |= val;
+		*retval |= val & mask;
 		return intel_secure_reg_write(reg_addr, *retval, retval);
 	}