diff --git a/drivers/dfu/dfu_tftp.c b/drivers/dfu/dfu_tftp.c
index 62bf797..f0afbac 100644
--- a/drivers/dfu/dfu_tftp.c
+++ b/drivers/dfu/dfu_tftp.c
@@ -38,7 +38,7 @@
 	}
 
 	strsep(&s, "@");
-	debug("%s: image name: %s strlen: %d\n", __func__, sb, strlen(sb));
+	debug("%s: image name: %s strlen: %zd\n", __func__, sb, strlen(sb));
 
 	alt_setting_num = dfu_get_alt(sb);
 	free(sb);
@@ -56,7 +56,7 @@
 		goto done;
 	}
 
-	ret = dfu_write_from_mem_addr(dfu, (void *)addr, len);
+	ret = dfu_write_from_mem_addr(dfu, (void *)(uintptr_t)addr, len);
 
 done:
 	dfu_free_entities();