diff --git a/lib/libbluetooth/bluetooth.3 b/lib/libbluetooth/bluetooth.3
index c91fe62c7684..8e64d3ce8bf0 100644
--- a/lib/libbluetooth/bluetooth.3
+++ b/lib/libbluetooth/bluetooth.3
@@ -87,7 +87,7 @@ The
 argument passed to
 .Fn bt_gethostbyname
 should point to a
-.Dv NULL Ns -terminated
+.Dv NUL Ns -terminated
 hostname.
 The
 .Fa addr
@@ -142,7 +142,7 @@ The
 argument passed to
 .Fn bt_getprotobyname
 should point to a
-.Dv NULL Ns -terminated
+.Dv NUL Ns -terminated
 Bluetooth Protocol Service Multiplexor name.
 The
 .Fa proto