diff --git a/extra/io/serial/unix/unix-tests.factor b/extra/io/serial/unix/unix-tests.factor
index e9b8d78e4b..f4c0c6b45a 100644
--- a/extra/io/serial/unix/unix-tests.factor
+++ b/extra/io/serial/unix/unix-tests.factor
@@ -5,7 +5,10 @@ IN: io.serial.unix
 
 : serial-obj ( -- obj )
     serial new
-    "/dev/ttyS0" >>path
+    "/dev/ttyS0" >>path ! linux
+    ! "/dev/dty00" >>path ! netbsd
+    ! "/dev/ttyd0" >>path ! freebsd
+    ! "/dev/ttyU0" >>path ! openbsd
     19200 >>baud
     { IGNPAR ICRNL } flags >>iflag
     { } flags >>oflag