diff --git a/configure.ac b/configure.ac
index 4dadf661d8c..029f451cd4a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1575,7 +1575,6 @@ case $opsys in
     LIB_MATH=
     SYSTEM_TYPE=windows-nt
     ;;
-  dnl NB this may be adjusted below.
   netbsd | openbsd )
     SYSTEM_TYPE=berkeley-unix
     ;;