diff --git a/lib/socket.c b/lib/socket.c
index 7c0a169..b393e0c 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -584,7 +584,7 @@ iscsi_iovector_readv_writev(struct iscsi_context *iscsi, struct scsi_iovector *i
 
 	if (pos < iovector->offset) {
 		iscsi_set_error(iscsi, "%s: iovector reset. pos(%d) is smaller than"
-				"current offset(%ld)", rw, pos, iovector->offset);
+				"current offset(%zu)", rw, pos, iovector->offset);
 		errno = EINVAL;
 		return -1;
 	}
diff --git a/utils/iscsi-discard.c b/utils/iscsi-discard.c
index f8ad18a..3a6e87d 100644
--- a/utils/iscsi-discard.c
+++ b/utils/iscsi-discard.c
@@ -220,7 +220,7 @@ int main(int argc, char *argv[])
 
 	capacity = block_length * (rc16->returned_lba + 1);
 	if (offset > capacity) {
-		fprintf(stderr,"Offset(%lu) exceeds capacity(%lu)\n", offset, capacity);
+		fprintf(stderr,"Offset(%" PRIu64 ") exceeds capacity(%" PRIu64 ")\n", offset, capacity);
 		goto free_task;
 	}