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 /* SM_NSSWITCH_DELIMS */
p = strpbrk(buf, SM_NSSWITCH_DELIMS);
if (p != NULL)