diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
index 57c669d..55d59ed 100644
--- a/tools/bootconfig/main.c
+++ b/tools/bootconfig/main.c
@@ -193,7 +193,7 @@ static int load_xbc_from_initrd(int fd, char **buf)
 	if (stat.st_size < BOOTCONFIG_FOOTER_SIZE)
 		return 0;
 
-	if (lseek(fd, -BOOTCONFIG_MAGIC_LEN, SEEK_END) < 0)
+	if (lseek(fd, -(off_t)BOOTCONFIG_MAGIC_LEN, SEEK_END) < 0)
 		return pr_errno("Failed to lseek for magic", -errno);
 
 	if (read(fd, magic, BOOTCONFIG_MAGIC_LEN) < 0)
@@ -203,7 +203,7 @@ static int load_xbc_from_initrd(int fd, char **buf)
 	if (memcmp(magic, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN) != 0)
 		return 0;
 
-	if (lseek(fd, -BOOTCONFIG_FOOTER_SIZE, SEEK_END) < 0)
+	if (lseek(fd, -(off_t)BOOTCONFIG_FOOTER_SIZE, SEEK_END) < 0)
 		return pr_errno("Failed to lseek for size", -errno);
 
 	if (read(fd, &size, sizeof(uint32_t)) < 0)