diff --git a/cmd/img_mgmt/port/zephyr/src/zephyr_img_mgmt.c b/cmd/img_mgmt/port/zephyr/src/zephyr_img_mgmt.c
index f41ba9a..484f75d 100644
--- a/cmd/img_mgmt/port/zephyr/src/zephyr_img_mgmt.c
+++ b/cmd/img_mgmt/port/zephyr/src/zephyr_img_mgmt.c
@@ -347,13 +347,13 @@
     rc = flash_area_erase(fa, 0, erase_size);
 
     if (rc != 0) {
-        LOG_ERR("image slot erase of 0x%x bytes failed (err %d)", erase_size,
+        LOG_ERR("image slot erase of 0x%zx bytes failed (err %d)", erase_size,
                 rc);
         rc = MGMT_ERR_EUNKNOWN;
         goto end_fa;
     }
 
-    LOG_INF("Erased 0x%x bytes of image slot", erase_size);
+    LOG_INF("Erased 0x%zx bytes of image slot", erase_size);
 
     /* erase the image trailer area if it was not erased */
     off = BOOT_TRAILER_IMG_STATUS_OFFS(fa);
@@ -365,13 +365,13 @@
 
         rc = flash_area_erase(fa, off, erase_size);
         if (rc != 0) {
-            LOG_ERR("image slot trailer erase of 0x%x bytes failed (err %d)",
+            LOG_ERR("image slot trailer erase of 0x%zx bytes failed (err %d)",
                     erase_size, rc);
             rc = MGMT_ERR_EUNKNOWN;
             goto end_fa;
         }
 
-        LOG_INF("Erased 0x%x bytes of image slot trailer", erase_size);
+        LOG_INF("Erased 0x%zx bytes of image slot trailer", erase_size);
     }
 
     rc = 0;