diff --git a/configure/CONFIG_ENV b/configure/CONFIG_ENV
index 0ace497ff..7f633ed11 100644
--- a/configure/CONFIG_ENV
+++ b/configure/CONFIG_ENV
@@ -36,6 +36,7 @@ EPICS_CA_REPEATER_PORT=5065
 EPICS_CA_SERVER_PORT=5064
 EPICS_CA_MAX_ARRAY_BYTES=16384
 EPICS_CA_BEACON_PERIOD=15.0
+EPICS_CA_MAX_SEARCH_PERIOD=300.0
 EPICS_CAS_BEACON_PERIOD=
 EPICS_CAS_BEACON_PORT=
 EPICS_CAS_AUTO_BEACON_ADDR_LIST=""
diff --git a/src/libCom/env/envDefs.h b/src/libCom/env/envDefs.h
index 367a6616c..1ab2792c1 100644
--- a/src/libCom/env/envDefs.h
+++ b/src/libCom/env/envDefs.h
@@ -56,6 +56,7 @@ epicsShareExtern READONLY ENV_PARAM EPICS_CA_AUTO_ADDR_LIST;
 epicsShareExtern READONLY ENV_PARAM EPICS_CA_REPEATER_PORT;
 epicsShareExtern READONLY ENV_PARAM EPICS_CA_SERVER_PORT;
 epicsShareExtern READONLY ENV_PARAM EPICS_CA_MAX_ARRAY_BYTES;
+epicsShareExtern READONLY ENV_PARAM EPICS_CA_MAX_SEARCH_PERIOD;
 epicsShareExtern READONLY ENV_PARAM EPICS_CAS_INTF_ADDR_LIST;
 epicsShareExtern READONLY ENV_PARAM EPICS_CAS_IGNORE_ADDR_LIST;
 epicsShareExtern READONLY ENV_PARAM EPICS_CAS_AUTO_BEACON_ADDR_LIST;