diff --git a/sendmail/conf.c b/sendmail/conf.c
index 63c545c..e9fa42c 100644
--- a/sendmail/conf.c
+++ b/sendmail/conf.c
@@ -1039,7 +1039,7 @@ 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)