diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index e09047a5e..d8648c873 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -111,3 +111,4 @@ LDLIBS_READLINE = -lreadline -lncurses
 #--------------------------------------------------
 # Allow site overrides
 -include $(CONFIG)/os/CONFIG_SITE.Common.RTEMS
+-include $(CONFIG)/os/CONFIG_SITE.$(EPICS_HOST_ARCH).RTEMS