diff --git a/util/mk1mf.pl b/util/mk1mf.pl
index 550ef9f685..1eee7aa349 100755
--- a/util/mk1mf.pl
+++ b/util/mk1mf.pl
@@ -326,7 +326,7 @@ open(IN,"<$infile") || die "unable to open $infile:$!\n";
 $_=<IN>;
 for (;;)
 	{
-	chop;
+	s/\s*$//; # was chop, didn't work in mixture of perls for Windows...
 
 	($key,$val)=/^([^=]+)=(.*)/;
 	if ($key eq "RELATIVE_DIRECTORY")