diff --git a/nsmb.conf b/nsmb.conf
index fce0813..0b26863 100644
--- a/nsmb.conf
+++ b/nsmb.conf
@@ -23,11 +23,14 @@ signing_required=no
 # Disable directory caching
 dir_cache_off=yes
 
-# Lock negotiation to SMB3 only
+# Lock negotiation to SMB2/3 only
 # 7 == 0111  SMB 1/2/3 should be enabled
 # 6 == 0110  SMB 2/3 should be enabled
 # 4 == 0100  SMB 3 should be enabled
 protocol_vers_map=6
 
+# No SMB1, so we disable NetBIOS
+port445=no_netbios
+
 # Turn off notifications
 notify_off=yes
\ No newline at end of file