diff --git a/cde/config/cf/site.def b/cde/config/cf/site.def
index 785d25945..3b8bb82f5 100644
--- a/cde/config/cf/site.def
+++ b/cde/config/cf/site.def
@@ -126,7 +126,9 @@ XCOMM  or building non-C locales will cause build failures.
 XCOMM Make sure you have installed the de_DE, es_ES, fr_FR and it_IT locales.
 XCOMM  or building non-C locales will cause build failures.
 XCOMM DtLocalesToBuild: de_DE.ISO8859-1 es_ES.ISO8859-1 fr_FR.ISO8859-1 it_IT.ISO8859-1 en_US.UTF-8
-# define DtLocalesToBuild en_US.UTF-8
+# if !defined(DtLocalesToBuild)
+#  define DtLocalesToBuild en_US.UTF-8
+# endif
 # define UTF8_NLS_SUPPORT
 #endif