diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 35a4f06c..e7eea328 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -449,6 +449,7 @@ freebsd*)
   ;;
 netbsd*)
   CAN_NATIVE_M68K=yes
+  ETHERSRC=ether_unix.cpp
   ;;
 solaris*)
   AUDIOSRC=Solaris/audio_solaris.cpp