1 files changed, 4 insertions, 0 deletions
diff --git a/nss/nsswitch.c b/nss/nsswitch.c
index f6d3988675..7799281695 100644
--- a/nss/nsswitch.c
+++ b/nss/nsswitch.c
@@ -24,6 +24,7 @@
 #include <bits/libc-lock.h>
 #include <search.h>
 #include <stdio.h>
+#include <stdio_ext.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -427,6 +428,9 @@ nss_parse_file (const char *fname)
   if (fp == NULL)
     return NULL;
 
+  /* No threads use this stream.  */
+  __fsetlocking (fp, FSETLOCKING_BYCALLER);
+
   result = (name_database *) malloc (sizeof (name_database));
   if (result == NULL)
     return NULL;