diff --git a/sendmail/conf.c b/sendmail/conf.c
index c73334e..cbb9c76 100644
--- a/sendmail/conf.c
+++ b/sendmail/conf.c
@@ -986,7 +986,7 @@ 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)