diff --git a/lib/socket.c b/lib/socket.c
index a855f92..6fc3b41 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -517,7 +517,7 @@ iscsi_read_from_socket(struct iscsi_context *iscsi)
 	}
 
 	data_size = iscsi_get_pdu_data_size(&in->hdr[0]);
-	if (data_size < 0 || data_size > iscsi->initiator_max_recv_data_segment_length) {
+	if (data_size < 0 || data_size > (ssize_t)iscsi->initiator_max_recv_data_segment_length) {
 		iscsi_set_error(iscsi, "Invalid data size received from target (%d)", (int)data_size);
 		return -1;
 	}