diff --git a/src/makeBaseExt/top/configure/CONFIG_EXTENSIONS b/src/makeBaseExt/top/configure/CONFIG_EXTENSIONS
index 2cd71784f..365ceef04 100644
--- a/src/makeBaseExt/top/configure/CONFIG_EXTENSIONS
+++ b/src/makeBaseExt/top/configure/CONFIG_EXTENSIONS
@@ -27,9 +27,7 @@ endif
 #  Site specific host-target combination definitions
 -include $(TOP)/configure/os/CONFIG_SITE.$(EPICS_HOST_ARCH).$(T_A)
 
-ifdef T_A
 -include $(TOP)/configure/O.$(T_A)/CONFIG_APP_INCLUDE
-endif
 
 endif