diff --git a/condor-ap/50-gratia-gwms.conf b/condor-ap/50-gratia-gwms.conf
index 24566f22..ec378930 100644
--- a/condor-ap/50-gratia-gwms.conf
+++ b/condor-ap/50-gratia-gwms.conf
@@ -39,3 +39,7 @@ SCHEDD_CRON_GRATIA_PERIOD = 15m
 SCHEDD_CRON_GRATIA_EXECUTABLE = /usr/share/gratia/condor-ap/condor_meter
 SCHEDD_CRON_GRATIA_PREFIX = GRATIA
 SCHEDD_CRON_GRATIA_ARGS = -f /etc/gratia/condor-ap/ProbeConfig
+
+# log gratia probe failures to aid debugging
+# see HTCONDOR-971 for knob details and SOFTWARE-6037 for rationale
+SCHEDD_CRON_LOG_NON_ZERO_EXIT = True