diff --git a/sendmail/conf.c b/sendmail/conf.c
index e7a9615..f1bc1b2 100644
--- a/sendmail/conf.c
+++ b/sendmail/conf.c
@@ -1044,7 +1044,7 @@ switch_map_find(service, maptype, mapreturn)
 				if (p != NULL)
 					*p = '\0';
 # ifndef SM_NSSWITCH_DELIMS
-#  define SM_NSSWITCH_DELIMS	" \t"
+#  define SM_NSSWITCH_DELIMS	" \t:"
 # endif
 				p = strpbrk(buf, SM_NSSWITCH_DELIMS);
 				if (p != NULL)