diff --git a/configure/CONFIG_ENV b/configure/CONFIG_ENV
index 3ec50c020..2c3d8d992 100644
--- a/configure/CONFIG_ENV
+++ b/configure/CONFIG_ENV
@@ -45,6 +45,7 @@ EPICS_CAS_BEACON_ADDR_LIST=""
 EPICS_CAS_SERVER_PORT=
 EPICS_CAS_INTF_ADDR_LIST=""
 EPICS_CAS_IGNORE_ADDR_LIST=""
+EPICS_MUTEX_USE_PRIORITY_INHERITANCE=NO
 
 # Servers to disable
 EPICS_IOC_IGNORE_SERVERS=""