diff --git a/plat/arm/common/arm_tzc400.c b/plat/arm/common/arm_tzc400.c
index a32736c..2ae084c 100644
--- a/plat/arm/common/arm_tzc400.c
+++ b/plat/arm/common/arm_tzc400.c
@@ -24,7 +24,7 @@
 void arm_tzc400_setup(const arm_tzc_regions_info_t *tzc_regions)
 {
 #ifndef EL3_PAYLOAD_BASE
-	int region_index = 1;
+	unsigned int region_index = 1U;
 	const arm_tzc_regions_info_t *p;
 	const arm_tzc_regions_info_t init_tzc_regions[] = {
 		ARM_TZC_REGIONS_DEF,
@@ -55,7 +55,7 @@
 		region_index++;
 	}
 
-	INFO("Total %d regions set.\n", region_index);
+	INFO("Total %u regions set.\n", region_index);
 
 #else /* if defined(EL3_PAYLOAD_BASE) */
 
diff --git a/plat/arm/common/arm_tzc_dmc500.c b/plat/arm/common/arm_tzc_dmc500.c
index 8cb81e7..6bd771b 100644
--- a/plat/arm/common/arm_tzc_dmc500.c
+++ b/plat/arm/common/arm_tzc_dmc500.c
@@ -20,7 +20,7 @@
 			const arm_tzc_regions_info_t *tzc_regions)
 {
 #ifndef EL3_PAYLOAD_BASE
-	int region_index = 1;
+	unsigned int region_index = 1U;
 	const arm_tzc_regions_info_t *p;
 	const arm_tzc_regions_info_t init_tzc_regions[] = {
 		ARM_TZC_REGIONS_DEF,
@@ -50,7 +50,7 @@
 		region_index++;
 	}
 
-	INFO("Total %d regions set.\n", region_index);
+	INFO("Total %u regions set.\n", region_index);
 
 #else
 	/* Allow secure access only to DRAM for EL3 payloads */