diff --git a/include/pwd.h b/include/pwd.h
index c222128926a..d390f30c4a5 100644
--- a/include/pwd.h
+++ b/include/pwd.h
@@ -34,6 +34,12 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+#ifdef CONFIG_LIBC_PASSWD_LINESIZE
+# define NSS_BUFLEN_PASSWD CONFIG_LIBC_PASSWD_LINESIZE
+#else
+# define NSS_BUFLEN_PASSWD 256
+#endif
+
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/