diff --git a/configure/os/CONFIG.Common.RTEMS b/configure/os/CONFIG.Common.RTEMS
index 2624f79e5..2ab22b4fe 100644
--- a/configure/os/CONFIG.Common.RTEMS
+++ b/configure/os/CONFIG.Common.RTEMS
@@ -27,6 +27,10 @@ ifneq ($(CONFIG),$(TOP)/configure)
 -include $(TOP)/configure/CONFIG_SITE.Common.RTEMS
 endif
 
+#--------------------------------------------------
+# Set RTEMS_BSP from T_A if not already done
+RTEMS_BSP ?= $(subst RTEMS-,,$(T_A))
+
 #-------------------------------------------------------
 # Pick up the RTEMS tool/path definitions from the RTEMS BSP directory.
 include $(RTEMS_BASE)/$(RTEMS_TARGET_CPU)-rtems$(RTEMS_VERSION)/$(RTEMS_BSP)/Makefile.inc