diff --git a/docker-compose/tango-prometheus-exporter/lofar2-slow-policy.json b/docker-compose/tango-prometheus-exporter/lofar2-slow-policy.json
index 8288104853ac9ca4e5384a60c1be9b126ea72463..f05afaf8f253767f63bcd6c8154b64b0c51e1aaf 100644
--- a/docker-compose/tango-prometheus-exporter/lofar2-slow-policy.json
+++ b/docker-compose/tango-prometheus-exporter/lofar2-slow-policy.json
@@ -63,6 +63,7 @@
         "stat/sdp/*": {
             "include": [
                 "FPGA_jesd204b_*",
+                "FPGA_signal_input_samples_delay_*",
                 "FPGA_sdp_info_*"
             ]
         },